GENERAL HISTOLOGY

Detailed explanation-1: -The secretory products of endocrine glands are called hormones and are secreted directly into the blood and then carried throughout the body where they influence only those cells that have receptor sites for that hormone.

Detailed explanation-2: -Endocrine glands, situated at various sites around the body, and in specialised areas of the brain. The cells in these glands secrete specific chemicals called hormones.

Detailed explanation-3: -Hormones and neurotransmitters are different chemical messengers, the former produced by the endocrine glands and the latter by the nervous system. Hormones are usually secreted from the endocrine system and released into the bloodstream, but they act on distant target cells.