Here's why:
* Hormones: Chemical messengers produced by glands that travel through the bloodstream to target cells and organs, regulating a wide range of bodily functions.
* Endocrine glands: Specialized organs that secrete hormones directly into the bloodstream. These glands include:
* Pituitary gland: "Master gland" that controls other endocrine glands.
* Thyroid gland: Regulates metabolism.
* Parathyroid glands: Regulate calcium levels.
* Adrenal glands: Produce stress hormones like cortisol and adrenaline.
* Pancreas: Produces insulin and glucagon, regulating blood sugar.
* Ovaries (female): Produce estrogen and progesterone.
* Testes (male): Produce testosterone.
While other organs and tissues also produce hormones (like the heart, stomach, kidneys, and even fat cells), the endocrine system is the primary source and plays a crucial role in maintaining homeostasis and overall body function.
