Distinguish between hormones and enzymes.

	Hormones	Enzymes
1. Glands	These are secreted by endocrine glands.	These are secreted by exocrine glands.
2. Transportation	They are transported by blood.	They are transported by ducts.
3. Amount :	The hormones are needed in less amount.	The enzymes are needed in more amount.
4. Chemical nature:	The hormones may be formed from amino acids, proteins, peptides and steroids.	Enzymes are only proteinous.
5. Change of nature :	Hormones undergo changes during chemical reaction.	Enzymes do not undergo any change.

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What hormones are secreted by the posterior pituitary gland ? What function does each serve ? Where are these hormones actually produced ?

In general, how do steroid hormones effect changes in their targets cells ?

Write a note on Melanocyte stimulating hormone.

Explain the following :

(1) Insulin lowers the blood sugar level.

(2) Adrenal medulla and the sympathetic nervous system function as a closely integrated system.

(3) Pituitary gland regulates the reproductive system.

(4) Feed back system controls the blood level of many hormones.

Chemical Coordination and Integration