Question

what is hormones.
why adrenaline is called emergency hormones​

Answer 1

Answer:

-A hormone (from the Greek participle ὁρμῶν, "setting in motion") is any member of a class of signaling molecules, produced by glands in multicellular organisms, that are transported by the circulatory system to target distant organs to regulate physiology and behavior. Hormones have diverse chemical structures, mainly of three classes:

+ eicosanoids

+ steroids

+ amino acid/protein derivatives (amines, peptides, and proteins)

-Adrenaline is a hormone secreted by adrenal medulla during stress. This is called as emergency hormone because it initiates quick reation which makes the individual to think and respond quickly to the stress. The hormone increases metabolic rate. there occurs dialation of blood vessels going to heart and the brain.

Answer 2

Answer:

Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions

It is called so because it initiates quick relation which makes the individual to think and respond quickly to the stress.