Animals including humans have a complex system of living including the nervous system and endocrine system for control and coordination. The endocrine system controls numerous involuntary physiological activities is responsible for the chemical coordination. It consists of endocrine glands which release hormones and are also called ductless glands. Hormones are the chemical substance which coordinates the activities of living organism and also their growth. Hormones are a kind of chemical messengers. Hormones are necessary for various activities in the body including growth and development and support to the nervous system.
The various characteristics of hormones are given below:
There are two types of glands in the body:
A gland which secretes its product into a duct (or tube) is called an exocrine gland.
For e.g. the salivary gland
A gland which does not have a duct and secretes its product directly into the blood stream is called an endocrine gland. Endocrine glands are ductless glands. Hormones are a kind of chemical messengers.
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