Question

who are called chemical messengers why

Answer 1

Hormones: the body's chemical messengers. The human body secretes and circulates some 50 different hormones. A wide variety of thesechemical substances are produced by endocrine cells, most of which are in glands. The hormones then enter the blood system to circulate throughout the body and activate target cells.

Answer 2

Hormones: the body's chemical messengers. The human body secretes and circulates some 50 different hormones. A wide variety of these chemical substances are produced by endocrine cells, most of which are in glands. The hormones then enter the blood system to circulate throughout the body and activate target cells.