AP BIOLOGY

Detailed explanation-1: -Most endocrine hormones are circulating hormones-they pass from the secretory cells that make them into interstitial fluid and then into the blood. Other hormones, termed local hormones, act locally on neighboring cells or on the same cell that secreted them without first entering the bloodstream.

Detailed explanation-2: -The endocrine glands in the human body are hypothalamus, testes, ovary, pancreas, thyroid, pituitary, pineal, parathyroid, thymus and adrenal gland. The liver does not secrete any hormone.

Detailed explanation-3: -The glands that make up the endocrine system produce chemical messengers called hormones that travel through the blood to other parts of the body. Important endocrine glands include the pituitary, thyroid, parathyroid, thymus, and adrenal glands.