The endocrine system is the body’s network of glands and hormone-producing tissues that regulate growth, metabolism, reproduction, stress responses, and many other essential functions.
Unlike the nervous system, which communicates through rapid electrical signals, the endocrine system sends chemical messengers called hormones into the bloodstream. These hormones travel throughout the body, allowing different organs and tissues to communicate and coordinate their activities.
Major endocrine glands include the pituitary gland, thyroid gland, parathyroid glands, adrenal glands, pancreas, ovaries, and testes. Together, they help regulate processes such as blood sugar, blood pressure, body temperature, sleep, mood, puberty, fertility, and growth.
QUICK FACT
- Not all hormone-producing cells are located in organs traditionally called endocrine glands; hormone-producing cells are distributed throughout several tissues.
- A very small amount of a hormone can produce significant effects throughout the body because hormones act on specific target cells equipped with matching receptors.
COMMONLY CONFUSED WITH
- Gland: a structural term; some glands are endocrine, while others are exocrine.
- Hormone: a chemical messenger produced by endocrine and other cells; it is not the system itself.
- Autonomic Nervous System: regulates many involuntary functions through neural signals, while the endocrine system primarily uses hormones.
- Nervous System: The endocrine system uses hormones carried in the bloodstream, producing effects that are generally slower but longer-lasting. The nervous system uses electrical impulses and neurotransmitters to produce rapid, short-term responses.
SEE ALSO
- Hormone
- Thyroid Gland
- Pituitary Gland
- Pancreas
- Nervous System
- Homeostasis
- Metabolism
- Insulin
- Autonomic Nervous System
