What are chemical messengers ?

What are the substances which mimic the natural chemical messengers ?

________ are the chemical messengers that are secreted into the blood directly.

Why are hormones called chemical messengers ?

"Hormones are chemical messengers and regulators". Explain.

Pheromones are chemical messengers produced by animals and released outside the body,The odor of these substances affects.

Why are hormones referred to as chemical messengers?

What are hormones? Why are they called chemical messengers? What are the general properties of hormones?

What are hormones? Why are they called chemical messengers? What are the general properties of hormones?

Drugs which supplement or substitute for chemical messengers are