QCM : Fundamentals of Human Body Systems — 10 questions

Explication

The mitochondrion is a double-membraned organelle known as the 'powerhouse of the cell' because it produces ATP through oxidative phosphorylation, providing energy for cellular activities.

Explication

Epithelial tissue types are classified based on cell shape and layering, such as squamous, cuboidal, and columnar, which is a standard classification supported by the content.

Explication

Hematopoiesis's main function is to produce blood cells, including red blood cells, white blood cells, and platelets, which are essential for oxygen transport, immune defense, and clotting, respectively.

Explication

The neuron doctrine, which established that neurons are discrete cells and fundamental units of the nervous system, was published by Santiago Ramón y Cajal around 1894. This publication marked a pivotal moment in nervous system anatomy, distinguishing neurons as individual entities rather than a continuous network.

Explication

Bones and muscles differ primarily in their structure and function: bones are rigid, support the body, and protect organs, while muscles are contractile tissues that enable movement. This fundamental difference makes option 0 the correct answer.

Explication

Arthur Keith and Martin Flack are credited with discovering the sinoatrial node in 1906, identifying it as the heart's natural pacemaker, which initiates the heartbeat.

Explication

The effective gas exchange in the respiratory system is primarily caused by the structure of the alveoli, which provide a large surface area and thin walls that facilitate diffusion of gases between air and blood.

Explication

The best action to improve fat digestion is to take enzyme supplements containing lipase, as lipase is the enzyme responsible for breaking down triglycerides into fatty acids and glycerol. This directly supports the digestive process of fats. Increasing dietary fiber does not aid in fat digestion; rather, it can interfere with nutrient absorption. Consuming more bile salts can help emulsify fats, but this is typically unnecessary unless there's a bile deficiency; supplementing with lipase directly addresses enzyme activity. Reducing carbohydrate intake does not directly affect fat digestion.

Explication

The nephron is the fundamental structural and functional unit of the kidney responsible for filtering blood and forming urine, making it the key component of the renal system.

Explication

The endocrine system is primarily composed of glands that secrete hormones directly into the bloodstream, which regulate various body functions. The other options describe the nervous, immune, and digestive systems, respectively, which are different body systems.