Hormones: Chemical messengers secreted by endocrine glands that regulate physiological processes such as growth, metabolism, and reproduction by binding to specific receptors on target cells.
Endocrine Glands: Specialized organs (e.g., thyroid, adrenal, pituitary) that produce and release hormones directly into the bloodstream to influence distant target tissues.
Homeostasis: The body's ability to maintain a stable internal environment through hormonal regulation, ensuring optimal functioning of cells and organs.
Receptors: Protein molecules located on or inside target cells that specifically bind hormones, initiating cellular responses; classified as membrane-bound or intracellular.
Negative Feedback: A regulatory mechanism where an increase in hormone levels inhibits further hormone secretion, maintaining hormone balance and preventing overproduction.
Neuroendocrine Regulation: The interaction between the nervous system and endocrine system, where neural signals influence hormone release (e.g., hypothalamus controlling pituitary secretion).
1. What is the primary function of the endocrine system?
2. Which of the following glands is considered the 'master gland' due to its regulatory influence on other endocrine glands?
3. What specific role does the hypothalamus play in regulating the pituitary gland according to the content?
Endocrine system — primary function?
Regulates body functions via hormones.
Hormones — definition?
Chemical messengers regulating body functions.
Major glands — hormone role?
Produce hormones controlling physiology.
Endocrine Glands — function?
Produce and release hormones into bloodstream.
Hormone classes — example?
Peptides, steroids, amines.
Homeostasis — role?
Maintains stable internal environment.
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