Hormone

Definition

Hormones are chemical messengers produced by glands in the endocrine system. They regulate various physiological processes by signaling organs and tissues to perform specific functions.

5 Must Know Facts For Your Next Test

1. Hormones are secreted directly into the bloodstream by endocrine glands.
2. They can affect growth, metabolism, mood, and reproductive processes.
3. Hormones bind to specific receptors on target cells to exert their effects.
4. The hypothalamus and pituitary gland play a central role in hormone regulation.
5. Hormonal imbalance can lead to diseases such as diabetes, hyperthyroidism, and Addison's disease.

Review Questions

• What is the primary function of hormones?
• How do hormones reach their target cells?
• Name two glands that are crucial for hormone regulation.

Related terms

Endocrine Gland: Organs that produce and secrete hormones directly into the blood.

Receptor:

A protein on or in a target cell that binds specifically to a hormone, triggering a response.

Hypothalamus:

A brain region controlling the pituitary gland and regulating hormone secretion.