1. Hormones bring about coordination in the body with the help of nervous system.
2. Endocrine system and nervous system together form neuro-endocrine system.
3. This system works in tune with the external and internal environmental changes.
4. The hormones are either excitatory or inhibitory. They bring about the actions accordingly to keep the body in homeostasis or equilibrium.
5. Almost all endocrine glands are controlled by negative feedback inhibition. Some glands are auto-regulatory. Therefore, the concentration of hormones cannot be in excess or in deficiency.
6. Almost all the functions such as metabolism, growth, reproduction, etc. are under the control of hormones. Therefore hormones are called regulators and messengers.
