Endocrine glands

Definition

Endocrine glands are specialized organs that release hormones directly into the bloodstream. These hormones regulate various bodily functions such as growth, metabolism, and reproduction.

5 Must Know Facts For Your Next Test

1. Endocrine glands include the pituitary, thyroid, adrenal, and pancreas.
2. Hormones released by endocrine glands can affect target cells at distant sites within the body.
3. The hypothalamus links the nervous system to the endocrine system via the pituitary gland.
4. Endocrine glands do not have ducts; they secrete hormones directly into the blood.
5. Imbalances in hormone levels can lead to diseases such as diabetes, hyperthyroidism, or Addison's disease.

Review Questions

• What are endocrine glands and how do they function?
• Name three major endocrine glands and a hormone each secretes.
• How does an imbalance in hormone levels affect the body?

Related terms

Pituitary Gland: A small gland located at the base of the brain that secretes multiple hormones affecting various bodily functions.

Hormone: A chemical substance produced by an endocrine gland that travels through the bloodstream to act on distant target cells.

Hypothalamus: A region of the brain that controls the pituitary gland and regulates homeostasis in conjunction with other systems.