Here's why:
* Gland Storage: Hormones are produced and stored in specialized glands, such as the pituitary gland, thyroid gland, pancreas, and adrenal glands.
* Secretion to an Organ: Hormones are secreted directly into the bloodstream and travel to target organs throughout the body.
* Restoration of Balance: Hormones act as chemical messengers that regulate a wide range of bodily functions, including metabolism, growth, reproduction, and mood. They help maintain homeostasis, which is the body's ability to maintain a stable internal environment.
Examples of Hormones and their Actions:
* Insulin (from pancreas): Regulates blood sugar levels by promoting glucose uptake by cells.
* Growth Hormone (from pituitary gland): Stimulates growth and development.
* Thyroid Hormone (from thyroid gland): Regulates metabolism and energy production.
* Estrogen and Testosterone (from ovaries and testes): Responsible for sexual development and function.
While some proteins like enzymes are also secreted by glands, their primary function is to catalyze specific biochemical reactions rather than regulating physiological processes across the body like hormones do.
