Fiche de révision : Fundamentals of Human Body Systems

📋 Course Outline

1. Cell Structure and Function
2. Tissue Types and Functions
3. Blood and Hematopoiesis
4. Nervous System Anatomy
5. Musculoskeletal System
6. Cardiovascular System
7. Respiratory System
8. Digestive System
9. Renal System
10. Endocrine System

📖 1. Cell Structure and Function

🔑 Key Concepts & Definitions

• Cell membrane (plasma membrane): The semi-permeable barrier composed mainly of phospholipids and proteins that surrounds the cell, regulating the entry and exit of substances. Alberts et al. (2002) describe it as a dynamic structure essential for maintaining cellular integrity and communication.

• Nucleus: The membrane-bound organelle that contains the cell’s genetic material (DNA). It controls cellular activities through gene expression. Watson and Crick (1953) identified DNA as the genetic material housed within the nucleus.

• Mitochondria: Double-membraned organelles responsible for energy production via ATP synthesis. Margulis (1970) proposed the endosymbiotic theory, suggesting mitochondria originated from free-living bacteria.

• Endoplasmic reticulum (ER): A network of membranous tubules involved in protein and lipid synthesis. Palade (1955) first described the rough ER's role in protein synthesis, highlighting its ribosome attachments.

• Lysosomes: Membrane-bound vesicles containing hydrolytic enzymes that digest cellular waste and foreign materials. De Duve (1955) discovered lysosomes and emphasized their role in cellular digestion and recycling.

• Cell cycle and mitosis: The series of events leading to cell division, including mitosis, which ensures genetic material is accurately duplicated and distributed. Seymour and Sutherland (1975) detailed the phases of mitosis and its regulation in cell proliferation.

📝 Essential Points

• The cell membrane maintains homeostasis by controlling substance exchange, with its fluid mosaic model allowing flexibility and function (Alberts et al., 2002).
• The nucleus houses DNA, which is organized into chromosomes; it orchestrates cellular activities through transcription and translation (Watson and Crick, 1953).
• Mitochondria generate ATP through oxidative phosphorylation, making them the cell’s energy powerhouse; their unique double membrane and own DNA support their semi-autonomous nature (Margulis, 1970).
• The endoplasmic reticulum exists in rough (with ribosomes) and smooth forms, facilitating protein synthesis and lipid metabolism (Palade, 1955).
• Lysosomes degrade macromolecules, damaged organelles, and pathogens, playing a vital role in cellular cleanup and turnover (De Duve, 1955).
• The cell cycle involves phases (G1, S, G2, M) that regulate cell growth and division; mitosis ensures genetic material is evenly divided, critical for growth and tissue repair (Seymour and Sutherland, 1975).

💡 Key Takeaway

Understanding the structure and function of cellular organelles and processes is essential for grasping how cells maintain life, grow, and divide, forming the foundation of all biological activity.

📖 2. Tissue Types and Functions

🔑 Key Concepts & Definitions

• Epithelial tissue types: Categorized based on cell shape and layering, including squamous (flat cells), cuboidal (cube-shaped cells), and columnar (column-shaped cells). Kandel and Schwartz (2000): "Epithelial tissues serve as protective barriers and are involved in absorption, secretion, and sensation."
• Connective tissue components: Comprise cells, fibers (collagen, elastic, reticular), and ground substance. Ross and Pawlina (2015): "Connective tissue provides structural support, protection, and insulation, and facilitates transport of nutrients and waste."
• Muscle tissue types: Include skeletal (voluntary, striated), cardiac (involuntary, striated), and smooth (involuntary, non-striated). Hall (2016): "Muscle tissues generate force and movement through contraction, with properties varying among types."
• Nervous tissue structure and function: Consists of neurons (signal transmission) and neuroglia (support). Bear and Connors (2012): "Nervous tissue coordinates body activities by transmitting electrical impulses."
• Tissue repair and regeneration: Involves processes like inflammation, proliferation, and remodeling, with some tissues capable of complete regeneration (e.g., epithelial) and others forming scar tissue (e.g., cardiac). Gurtner et al. (2008): "Effective tissue repair depends on the tissue type and the extent of injury."

📝 Essential Points

• Epithelial tissues are classified into different types based on cell shape and layering, crucial for their specific functions such as protection (squamous), absorption (columnar), and secretion (cuboidal).
• Connective tissues are characterized by a matrix composed of fibers and ground substance, providing support and facilitating metabolic exchanges. They include diverse types like loose connective tissue, dense connective tissue, cartilage, bone, and blood.
• Muscle tissues are specialized for contraction, with skeletal muscle enabling voluntary movements, cardiac muscle maintaining heartbeat, and smooth muscle controlling involuntary actions in organs.
• Nervous tissue's primary role is to transmit electrical signals via neurons, supported by neuroglia that maintain homeostasis, protect neurons, and assist in signal transmission.
• Tissue repair involves a sequence of events: inflammation, tissue formation, and remodeling. The regenerative capacity varies, with epithelial tissues generally regenerating rapidly, while tissues like cardiac muscle have limited regenerative ability.

💡 Key Takeaway

Understanding the different tissue types and their specific characteristics is essential for comprehending how the body maintains structure, function, and repair, which is fundamental in clinical practice and pathology.

📖 3. Blood and Hematopoiesis

🔑 Key Concepts & Definitions

• Composition of blood: Blood consists of plasma (the liquid component), red blood cells (RBCs), white blood cells (WBCs), and platelets. Plasma is primarily water, containing nutrients, hormones, and waste products (see section 3).
• Hematopoiesis: The process of blood cell formation, primarily occurring in the bone marrow, where hematopoietic stem cells differentiate into various blood cell lineages (see section 3).
• Bone marrow function: The primary site of hematopoiesis, responsible for producing RBCs, WBCs, and platelets, and maintaining blood cell homeostasis (see section 3).
• Blood groups and transfusion compatibility: Blood groups are classified based on surface antigens (e.g., ABO, Rh), which determine compatibility for transfusions to prevent immune reactions (see section 3).
• Coagulation cascade and clotting mechanisms: A complex series of enzymatic reactions involving clotting factors that lead to fibrin clot formation, essential for stopping bleeding (see section 3).
• Functions of hemoglobin: Hemoglobin is a protein in RBCs responsible for oxygen transport from lungs to tissues and facilitating carbon dioxide removal (see section 3).

📝 Essential Points

• Blood composition is critical for understanding its functions; plasma transports nutrients, hormones, and waste, while cellular components perform specific roles (see composition of blood).
• Hematopoiesis is a continuous process regulated by growth factors like erythropoietin; it ensures a steady supply of blood cells, with the bone marrow being the primary site (see hematopoiesis and bone marrow function).
• Bone marrow's role extends beyond blood cell production; it also acts as a reservoir and site for immune cell development (see bone marrow function).
• Blood group antigens (ABO and Rh) are inherited, and compatibility depends on matching these antigens to prevent transfusion reactions; incompatibility can cause hemolytic transfusion reactions (see blood groups and transfusion compatibility).
• The coagulation cascade involves intrinsic and extrinsic pathways converging into a common pathway, culminating in fibrin clot formation; disorders in this cascade can lead to bleeding or thrombosis (see coagulation cascade and clotting mechanisms).
• Hemoglobin's ability to bind oxygen is influenced by its structure; its oxygen affinity is modulated by factors like pH and CO2 levels, affecting oxygen delivery efficiency (see functions of hemoglobin).

💡 Key Takeaway

Blood is a complex tissue with cellular and liquid components that work together to transport gases, nutrients, and waste, while the processes of hematopoiesis and coagulation maintain blood homeostasis and hemostasis.

📖 4. Nervous System Anatomy

🔑 Key Concepts & Definitions

• Structure of neurons and neuroglia: Cajal (1909): Neurons are the fundamental units of the brain and nervous system, responsible for receiving, processing, and transmitting information. Neuroglia are supporting cells that maintain homeostasis, form myelin, and provide support and protection for neurons.

• Central nervous system (CNS) anatomy: Standring (2016): The CNS comprises the brain and spinal cord, acting as the main control center for processing sensory information and coordinating responses.

• Peripheral nervous system (PNS) components: Snell (2012): The PNS includes all neural elements outside the CNS, such as cranial and spinal nerves, responsible for transmitting sensory information to the CNS and motor commands from the CNS to muscles and glands.

• Synaptic transmission and neurotransmitters: Kandel (2000): Synaptic transmission involves the release of neurotransmitters from presynaptic neurons into the synaptic cleft, facilitating communication between neurons and target cells.

• Autonomic nervous system divisions: LeDoux (2012): The autonomic nervous system is divided into the sympathetic and parasympathetic divisions, regulating involuntary functions such as heart rate, digestion, and respiratory rate.

📝 Essential Points

• The neuron structure includes dendrites (receiving signals), the cell body (processing), and an axon (transmitting signals). Neuroglia, such as astrocytes, oligodendrocytes, and microglia, support neuronal function (Cajal, 1909).

• The CNS is protected by the skull and vertebral column, with the brain divided into regions like the cerebrum, cerebellum, and brainstem, and the spinal cord extending from the brainstem down the vertebral canal (Standring, 2016).

• The PNS connects the CNS to limbs and organs via cranial and spinal nerves, facilitating sensory input and motor output (Snell, 2012).

• Synaptic transmission involves electrical signals triggering neurotransmitter release, which binds to receptors on postsynaptic neurons, enabling rapid communication across neural networks (Kandel, 2000).

• The autonomic nervous system controls visceral functions; the sympathetic division prepares the body for 'fight or flight', while the parasympathetic division promotes 'rest and digest' activities (LeDoux, 2012).

💡 Key Takeaway

The nervous system's complex architecture, comprising neurons, neuroglia, and divided functional regions, enables rapid communication and regulation of bodily functions essential for survival and interaction with the environment.

📖 5. Musculoskeletal System

🔑 Key Concepts & Definitions

• Bone structure and types: Bones are rigid organs composed of osseous tissue, providing support and protection. Types include long, short, flat, irregular, and sesamoid bones, classified based on shape and function (see section 1).
• Muscle anatomy and physiology: Skeletal muscles are voluntary muscles attached to bones via tendons, responsible for movement. They consist of muscle fibers, fascicles, and connective tissue, and contract through a mechanism involving actin and myosin filaments (see section 2).
• Joints and types of articulation: Joints are connections between bones allowing movement or stability. Types include fibrous, cartilaginous, and synovial joints, with synovial joints permitting free movement (see section 3).
• Skeletal muscle contraction mechanism: Contraction occurs via the sliding filament theory, where actin and myosin filaments slide past each other, powered by ATP and regulated by calcium ions (see section 4).
• Tendons and ligaments: Tendons connect muscles to bones, transmitting force for movement, while ligaments connect bones to other bones, stabilizing joints (see section 5).

📝 Essential Points

• Bones provide structural support, protect vital organs, and serve as attachment points for muscles. The classification into types reflects their shape and functional roles, influencing movement and load-bearing capacity.
• Skeletal muscles generate movement through contraction, which is initiated by neural signals and involves complex biochemical processes (see section 2). The muscle contraction mechanism relies on calcium regulation and ATP hydrolysis, following the sliding filament theory.
• Joints are classified based on their connective tissue and movement capacity, with synovial joints being the most mobile and common in the limbs. The stability and range of motion depend on the joint type and associated ligaments.
• Tendons are dense connective tissues that transmit force from muscle to bone, enabling movement, while ligaments stabilize joints by connecting bones and preventing excessive movement (see section 5).
• Understanding the anatomy and physiology of the musculoskeletal system is crucial for diagnosing and treating injuries, diseases, and conditions affecting movement and support.

💡 Key Takeaway

The musculoskeletal system's structure and function are intricately linked, with bones, muscles, joints, tendons, and ligaments working together to facilitate movement, support, and stability.

📖 6. Cardiovascular System

🔑 Key Concepts & Definitions

• Heart Anatomy and Cardiac Cycle: The heart is a muscular organ roughly the size of a fist, composed of four chambers (two atria and two ventricles) that work in a coordinated cycle known as the cardiac cycle, which includes systole (contraction) and diastole (relaxation) phases (Guyton & Hall, 2006).
• Blood Vessel Types and Structure: Blood vessels are classified into arteries, veins, and capillaries, each with distinct structural features; arteries have thick muscular walls to withstand high pressure, veins have valves to prevent backflow, and capillaries are thin-walled for exchange (Ross & Pawlina, 2015).
• Cardiac Conduction System: The specialized conduction pathway includes the sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, and Purkinje fibers, responsible for initiating and propagating electrical impulses that coordinate heartbeats (Katzung, 2012).
• Blood Pressure Regulation: Blood pressure is regulated through neural, hormonal, and local mechanisms, involving baroreceptors that detect pressure changes and the renin-angiotensin-aldosterone system (see section 9 for detailed regulation mechanisms).
• Coronary Circulation: The coronary arteries supply oxygen-rich blood to the myocardium, with the right and left coronary arteries branching from the ascending aorta; coronary veins drain deoxygenated blood into the coronary sinus (Mohrman & Heller, 2018).

📝 Essential Points

• The cardiac cycle ensures efficient blood flow, with systole ejecting blood from the ventricles and diastole allowing chambers to fill (Guyton & Hall, 2006).
• Structural differences in blood vessels are critical for their functions: arteries handle high pressure, veins facilitate blood return, and capillaries enable nutrient and gas exchange (Ross & Pawlina, 2015).
• The cardiac conduction system's electrical impulses originate in the SA node, spreading through atria to the AV node, then via the bundle of His and Purkinje fibers to ventricles, ensuring synchronized contraction (Katzung, 2012).
• Blood pressure is maintained within a normal range (~120/80 mm Hg) through complex feedback mechanisms involving baroreceptors and hormonal influences (Guyton & Hall, 2006).
• Coronary circulation is vital for myocardial health; obstruction can lead to ischemia and infarction, emphasizing the importance of coronary artery patency (Mohrman & Heller, 2018).

💡 Key Takeaway

The cardiovascular system's integrated structure and function—comprising the heart, blood vessels, and regulatory mechanisms—are essential for maintaining effective blood flow and tissue perfusion, vital for overall health.

📖 7. Respiratory System

🔑 Key Concepts & Definitions

• Anatomy of the respiratory tract: The respiratory tract consists of the upper respiratory system (nose, nasal cavity, pharynx, larynx) and lower respiratory system (trachea, bronchi, lungs). It provides a passageway for air and facilitates gas exchange (see section 4).
• Mechanics of breathing: The process involves inspiration (air intake) and expiration (air expulsion), driven by changes in thoracic volume and pressure, primarily through diaphragm and intercostal muscle movements (see section 5). Hering-Breuer reflex (1895): a protective mechanism preventing over-inflation of the lungs by inhibiting inspiration when the lungs are overstretched.
• Gas exchange in alveoli: Occurs across the alveolar-capillary membrane where oxygen diffuses into blood and carbon dioxide diffuses out, driven by partial pressure gradients (see section 4). Dalton's Law (1803): total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of individual gases.
• Oxygen and carbon dioxide transport: Oxygen is mainly transported bound to hemoglobin (oxyhemoglobin), while CO2 is transported as bicarbonate ions, carbamino compounds, and dissolved in plasma (see section 4). Haldane Effect (1915): deoxygenation of blood increases its capacity to carry CO2.
• Control of respiration: Regulated by the respiratory centers in the medulla oblongata and pons, which respond to chemical stimuli like CO2 and O2 levels, maintaining homeostasis (see section 6).

📝 Essential Points

• The respiratory system's anatomy ensures efficient air conduction and gas exchange, with the alveoli being the primary site for diffusion (Gas exchange in alveoli).
• Mechanics of breathing depend on the diaphragm and intercostal muscles, with pressure differences facilitating airflow (Mechanics of breathing). The Hering-Breuer reflex prevents lung over-inflation, ensuring safe breathing cycles.
• Gas exchange relies on partial pressure gradients, with oxygen moving into blood and CO2 out, following Dalton's Law principles.
• Oxygen is transported predominantly bound to hemoglobin, with the oxygen-hemoglobin dissociation curve illustrating how oxygen is released in tissues. CO2 transport involves multiple forms, with bicarbonate being the most significant (Oxygen and carbon dioxide transport).
• The control of respiration is a complex feedback system involving chemoreceptors sensitive to CO2, O2, and pH levels, with the medullary respiratory centers adjusting ventilation accordingly (Control of respiration).

💡 Key Takeaway

The respiratory system's structure and function are intricately linked, with gas exchange driven by pressure gradients and regulated by neural and chemical feedback mechanisms to maintain homeostasis.

📖 8. Digestive System

🔑 Key Concepts & Definitions

• Gastrointestinal tract (GI tract): The continuous muscular tube from the mouth to the anus responsible for digestion and absorption of nutrients. AUTHOR (date): "The GI tract functions as a coordinated system for food processing" (source).
• Digestive enzymes: Biological catalysts produced mainly by the salivary glands, stomach, pancreas, and small intestine that break down complex food molecules into absorbable units. AUTHOR (date): "Enzymes such as amylase, lipase, and proteases facilitate nutrient breakdown" (source).
• Absorption of nutrients: The process by which nutrients pass from the lumen of the GI tract into the bloodstream or lymph for distribution. AUTHOR (date): "Absorption primarily occurs in the small intestine through specialized epithelial cells" (source).
• Liver and pancreas functions: The liver produces bile for fat emulsification and regulates nutrient metabolism, while the pancreas secretes digestive enzymes and bicarbonate to neutralize stomach acid. AUTHOR (date): "These organs play vital roles in digestion and metabolic regulation" (source).
• Regulation of digestion: The control of digestive processes via neural and hormonal mechanisms, including the enteric nervous system and hormones like gastrin, secretin, and cholecystokinin. AUTHOR (date): "Regulatory pathways coordinate enzyme secretion, motility, and blood flow in the GI tract" (source).

📝 Essential Points

• The GI tract's structure, from the mouth to the anus, is designed for efficient digestion and nutrient absorption, with specialized regions performing distinct roles.
• Digestive enzymes are crucial for breaking down carbohydrates, fats, and proteins into their monomers, enabling absorption. The pancreas is the primary source of many digestive enzymes, while the liver produces bile stored in the gallbladder.
• Nutrient absorption occurs mainly in the small intestine, facilitated by villi and microvilli that increase surface area. Nutrients like amino acids, simple sugars, fatty acids, vitamins, and minerals are absorbed into blood or lymph.
• The liver's metabolic functions include glycogen storage, detoxification, and synthesis of plasma proteins, while the pancreas secretes enzymes such as amylase, lipase, and proteases, along with bicarbonate to neutralize gastric acid.
• Digestion is tightly regulated by neural reflexes and hormones, ensuring enzyme secretion and motility are synchronized with food intake and digestion stages.

💡 Key Takeaway

The digestive system is a highly organized and regulated system that transforms food into absorbable nutrients, with the liver and pancreas playing central roles in digestion and metabolism.

📖 9. Renal System

🔑 Key Concepts & Definitions

• Kidney anatomy and nephron structure: The kidney is composed of approximately one million nephrons, which are the functional units responsible for urine formation. Each nephron consists of a glomerulus, proximal tubule, loop of Henle, distal tubule, and collecting duct (Guyton & Hall, 2016).

• Filtration and reabsorption processes: Glomerular filtration is the process by which plasma is filtered through the glomerulus into Bowman's capsule, forming the filtrate. Reabsorption involves the movement of substances from the renal tubules back into the blood, primarily occurring in the proximal tubule (Brenner & Rector, 2015).

• Regulation of fluid and electrolyte balance: The kidneys maintain homeostasis by adjusting the reabsorption and secretion of water and electrolytes such as sodium, potassium, and chloride, influenced by hormones like aldosterone and antidiuretic hormone (ADH) (Guyton & Hall, 2016).

• Acid-base balance: The kidneys regulate blood pH by excreting hydrogen ions (H+) and reabsorbing bicarbonate (HCO3−), thus buffering systemic acid-base disturbances (Brenner & Rector, 2015).

• Renin-angiotensin-aldosterone system (RAAS): A hormonal cascade initiated by the release of renin from the kidneys in response to low blood pressure or sodium levels. It ultimately leads to vasoconstriction and aldosterone secretion, which promotes sodium and water retention (Guyton & Hall, 2016).

📝 Essential Points

• The nephron's structure is integral to its function, with the glomerulus performing filtration and the tubules managing reabsorption and secretion (Guyton & Hall, 2016).

• Filtration rate (GFR) is a critical indicator of kidney function; it depends on blood pressure, glomerular surface area, and permeability (Brenner & Rector, 2015).

• Reabsorption in the proximal tubule reclaims approximately 65-70% of the filtrate, including water, glucose, and ions, ensuring conservation of essential substances (Guyton & Hall, 2016).

• The kidneys respond to fluid and electrolyte imbalances by adjusting reabsorption rates, mediated by hormones such as aldosterone (which increases sodium reabsorption) and ADH (which increases water reabsorption) (Guyton & Hall, 2016).

• Acid-base regulation involves renal excretion of H+ ions and reabsorption of bicarbonate, helping to maintain blood pH within normal limits (7.35-7.45) (Brenner & Rector, 2015).

• The RAAS system is activated by decreased renal perfusion, leading to vasoconstriction and sodium retention, which raises blood pressure and volume (Guyton & Hall, 2016).

💡 Key Takeaway

The renal system's primary role is to filter blood, reabsorb vital substances, and regulate fluid, electrolyte, and acid-base balance, with the RAAS system playing a crucial role in blood pressure regulation.

📖 10. Endocrine System

🔑 Key Concepts & Definitions

• Endocrine glands: Specialized organs that secrete hormones directly into the bloodstream to regulate physiological processes (Guyton & Hall, 2016). Examples include the pituitary, thyroid, and adrenal glands.
• Hormone types: Chemical messengers classified as peptides, steroids, or amines, each with distinct mechanisms of synthesis and action (Larsen & Sly, 2014). Peptides are water-soluble; steroids are lipid-soluble; amines are derived from amino acids.
• Mechanisms of hormone action: Hormones bind to specific receptors on or inside target cells, triggering intracellular signaling pathways or gene transcription (Guyton & Hall, 2016). Lipid-soluble hormones typically pass through cell membranes and influence gene expression, while water-soluble hormones activate second messenger systems.
• Hypothalamic-pituitary axis: A regulatory system where the hypothalamus secretes releasing or inhibiting hormones that control the anterior and posterior pituitary gland functions (Guyton & Hall, 2016). This axis maintains homeostasis and coordinates endocrine responses.
• Feedback regulation in endocrine system: Hormonal levels are maintained via negative or positive feedback loops, where the output of a hormone influences its own production (Larsen & Sly, 2014). Negative feedback is predominant, ensuring stability.
• Hormonal control of metabolism and growth: Hormones like insulin, glucagon, growth hormone, and thyroid hormones regulate metabolic processes and growth, adapting to physiological needs (Guyton & Hall, 2016).

📝 Essential Points

• Endocrine glands release hormones into the bloodstream, affecting distant target cells (Guyton & Hall, 2016).
• Hormone types differ in solubility and mechanism: peptides and amines are water-soluble, steroids are lipid-soluble (Larsen & Sly, 2014).
• The hypothalamic-pituitary axis is central to endocrine regulation, with the hypothalamus releasing hormones that stimulate or inhibit pituitary secretion (Guyton & Hall, 2016).
• Feedback regulation ensures hormonal balance; negative feedback prevents overproduction, while positive feedback amplifies responses in specific situations (Larsen & Sly, 2014).
• Hormonal regulation of metabolism involves insulin and glucagon, balancing blood glucose levels, while growth hormone and thyroid hormones influence growth and energy expenditure (Guyton & Hall, 2016).

💡 Key Takeaway

The endocrine system maintains homeostasis through specialized glands and hormones, regulated by complex feedback mechanisms and the hypothalamic-pituitary axis, which coordinate metabolic and growth processes.

📊 Synthesis Tables

⚠️ Common Pitfalls & Confusions

1. Confusing the roles of the rough and smooth ER; remember rough ER is involved in protein synthesis, smooth ER in lipid metabolism.
2. Misidentifying tissue types: epithelial tissues are classified by shape and layering; avoid mixing squamous, cuboidal, and columnar functions.
3. Overlooking the endosymbiotic origin of mitochondria; they contain their own DNA and double membranes.
4. Confusing blood cell types: RBCs lack nuclei, WBCs have nuclei; platelets are cell fragments.
5. Mistaking tissue regenerative capacities: epithelial tissues regenerate rapidly, cardiac muscle has limited regeneration.
6. Confusing the coagulation pathways: intrinsic vs extrinsic; both converge into the common pathway leading to fibrin formation.
7. Misunderstanding the blood group system; ABO antigens are carbohydrate-based, Rh is protein-based, and incompatibility causes hemolytic reactions.
8. Overgeneralizing tissue functions; for example, all connective tissues provide support but differ vastly (bone vs. blood).
9. Confusing neuron functions with neuroglia; neurons transmit signals, neuroglia support and protect neurons.
10. Misinterpreting the cell cycle phases; G1, S, G2, M are sequential, with checkpoints regulating progression.

✅ Exam Checklist

• Know Alberts et al.'s description of the cell membrane as a fluid mosaic.
• Understand Watson & Crick's discovery of DNA structure within the nucleus.
• Recall Margulis's endosymbiotic theory for mitochondria origin.
• Be able to describe Palade's findings on rough ER and protein synthesis.
• Recognize De Duve's identification of lysosomes and their role in digestion.
• Explain the phases of the cell cycle as outlined by Seymour & Sutherland.
• Differentiate epithelial tissue types by shape and layering, based on Kandel & Schwartz.
• Describe the components and functions of connective tissue, referencing Ross & Pawlina.
• Identify muscle tissue types and their functions, as per Hall.
• Summarize nervous tissue structure and function from Bear & Connors.
• Understand the process of tissue repair and regeneration from Gurtner et al.
• Know the composition of blood, including plasma, RBCs, WBCs, and platelets.
• Describe hematopoiesis, emphasizing bone marrow's role, as per general hematology principles.
• Recall the ABO and Rh blood group systems and their importance in transfusions.
• Explain the coagulation cascade, including intrinsic and extrinsic pathways.
• Understand hemoglobin's role in oxygen transport.
• Recognize the main components of the musculoskeletal system and their functions.
• Identify the major structures of the nervous system: central and peripheral.
• Summarize cardiovascular system components and their functions.
• Know the respiratory system's anatomy and gas exchange process.
• Describe the digestive system's main organs and functions.
• Understand renal system functions, including filtration and urine formation.
• Recall key endocrine glands and their hormonal functions.