Question

Define hormone? write four characterstics of hormones in humans

Answer 1

A hormone is a chemical messenger that regulates physiological processes in living organisms. It is secreted by a gland.

Characteristics of hormones:

• Hormones act as chemical messengers.

• They are secreted by living cells/tissues or organs called glands.

• They are secreted in very small quantities by glands.

• They act upon specific cells, tissues, or organs called the target sites.

• They are generally slow in action, but have long lasting effects.

• They either accelerate or inhibit a reaction.