Endocrine System

Chapter 8

Endocrine System

A system responsible for regulating various bodily functions through hormones.

Hormones

Chemicals released into the bloodstream to target specific organs and tissues.

Pituitary Gland

Often called the 'master gland', it controls other endocrine glands and regulates growth and metabolism.

Thyroid Gland

Produces hormones that regulate metabolism, energy generation, and overall growth and development.

Adrenal Glands

Responsible for producing hormones like cortisol and adrenaline that help the body respond to stress.

Pancreas

Plays a crucial role in glucose metabolism by producing insulin and glucagon.

Amines

A class of hormones derived from amino acids.

Polypeptides and Proteins

A class of hormones made up of chains of amino acids.

Glycoproteins

Hormones that are proteins with carbohydrate components.

Steroids

A class of hormones derived from cholesterol.

Adipose Tissue

A connective tissue that stores energy in the form of fat.

Pineal Gland

A small gland in the brain that produces melatonin and regulates sleep-wake cycles.

Hypothalamus

Located below the thalamus, it maintains homeostasis and secretes hormones that control the pituitary gland.

Anterior Pituitary Gland

Also known as adenohypophysis, it has three regions: pars tuberalis, pars intermedia, and pars distalis.

Posterior Pituitary Gland

Also known as neurohypophysis, it stores and releases hormones produced by the hypothalamus.

Infundibulum

A stalk that connects the hypothalamus to the pituitary gland.

Endocrine System

A system responsible for regulating various bodily functions through hormones.

Hormones

Chemicals released into the bloodstream to target specific organs and tissues.

Pituitary Gland

Often called the 'master gland', it controls other endocrine glands and regulates growth and metabolism.

Thyroid Gland

Produces hormones that regulate metabolism, energy generation, and overall growth and development.

Adrenal Glands

Responsible for producing hormones like cortisol and adrenaline that help the body respond to stress.

Pancreas

Plays a crucial role in glucose metabolism by producing insulin and glucagon.

Amines

A class of hormones derived from amino acids.

Polypeptides and Proteins

A class of hormones made up of chains of amino acids.

Glycoproteins

Hormones that are proteins with carbohydrate components.

Steroids

A class of hormones derived from cholesterol.

Adipose Tissue

A connective tissue that stores energy in the form of fat.

Pineal Gland

A small gland in the brain that produces melatonin and regulates sleep-wake cycles.

Hypothalamus

Located below the thalamus, it maintains homeostasis and secretes hormones that control the pituitary gland.

Anterior Pituitary Gland

Also known as adenohypophysis, it has three regions: pars tuberalis, pars intermedia, and pars distalis.

Posterior Pituitary Gland

Also known as neurohypophysis, it stores and releases hormones produced by the hypothalamus.

Infundibulum

A stalk that connects the hypothalamus to the pituitary gland.

Negative Feedback Loop

The primary mechanism of homeostatic control where the response of the regulator reduces the original stimulus (e.g., maintaining blood glucose or thyroid hormone levels).

Target Cells

Specific cells that possess the appropriate receptors for a particular hormone, allowing for a localized or tissue-specific response.

Parathyroid Glands

Small glands located on the posterior surface of the thyroid that secrete Parathyroid Hormone ($PTH$) to regulate calcium levels.

Antidiuretic Hormone ($ADH$)

A hormone produced by the hypothalamus and released by the posterior pituitary that promotes water retention by the kidneys.

Lipid-Soluble Hormones

Hormones (like steroids and thyroid hormones) that can cross cell membranes and often bind to intracellular receptors to influence gene expression.

Water-Soluble Hormones

Hormones (like polypeptides and catecholamines) that cannot cross cell membranes and instead bind to surface receptors, often utilizing second messenger systems like $cAMP$.