Final answer:
The main function of the endocrine system is cell communication (signaling). It consists of cells, tissues, and organs that secrete hormones to regulate homeostasis. Examples of endocrine glands include the adrenal glands and thyroid gland.
Step-by-step explanation:
The main function of the endocrine system is cell communication (signaling).
The endocrine system consists of cells, tissues, and organs that secrete hormones critical to homeostasis. It coordinates with the nervous system to regulate the functions of other organ systems. Hormones are chemical messengers released from glands and travel through the bloodstream to target cells, where they elicit a response. Examples of endocrine glands include the adrenal glands and thyroid gland.