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Chemical Coordination and Integration

Write a note on Melanocyte stimulating hormone.

Melanocyte stimulating hormone is secreted by intermediatory lobe of pituitary gland or pars intermedia. It acts on the melanocytes and regulates the pigmentation of the skin.

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

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

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.

Distinguish between hormones and enzymes.

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