Chemical coordination in animals is performed by hormones that are chemical messengers. Different endocrine glands secrete different hormones to regulate various processes.
These hormones are released into the blood which carry them to specific tissues or argans called target tissues/organs. In the target tissue, hormone triggers a particular biochemical or physiological activity.
The hormones are of different types and perform different function. Their timing of release and their amount is gulated by feedback mechanism.
