Chemical Coordination and Integration Class 11 Notes – Chapter 22
The glands are secretory organs and are of two main types, viz. (i) exocrine glands and (ii) endocrine or ductless glands. Endocrine glands secrete active substances called Hormones. Hormones are informational molecules. They are secreted in response to changes in the environment inside or outside the body. They are secreted into the blood, which distributes it all over the body, especially to their target organs and tissues.
Hormones are the chemical substances produced from an endocrine or a ductless gland. They may be defined as, “substances which are produced in one part of an organism and transferred to some other part where their physiological effects are observed”. Chemically they may be polypeptides, steroids and biogenic amines (non-protein compounds containing amino group). Please refer Chemical Coordination and Integration Class 11 Notes for more revision notes.
CBSE Revision Notes 