Here's why:
* Produced by specialized cells: Hormones are created and secreted by specific endocrine glands or specialized cells within organs.
* Affects metabolism or behavior: Hormones act as chemical messengers that travel through the bloodstream to target cells and organs, influencing their functions. This can include regulating metabolism, growth, reproduction, mood, and many other bodily processes.
* Signaling: Hormones bind to specific receptors on target cells, triggering a cascade of events that ultimately change cellular behavior.
Examples of hormones:
* Insulin: Regulates blood sugar levels.
* Growth hormone: Promotes growth and development.
* Estrogen and testosterone: Sex hormones that influence reproductive development and function.
* Cortisol: Stress hormone involved in regulating metabolism and immune response.
