Tips and Tricks

Nervous system:It is a system of internal communication made up of nervous tissue.
The nervous system of man consists of three components:

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• The process of elimination of metabolic wastes from the body is called excretion.’

• There are three types of nitrogenous wastes. They are ammonia, urea and uric acid.

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• The circulation is the mechanism by which blood is circulated around the body.

• The circulatory system consists of the HEART, BLOOD and BLOOD VESSELS.

• The heart pumps the blood and blood vessels carry the blood.
  

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Respiration is a process which involves the exchange of respiratory gases (co2 and O2) between the organism and external environment.

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Digestion is a physiological process during which the food is mechanically and physiologically broken down in to simple molecules.

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Genetics
Genetics is the branch of biology which deals with the study of heredity and variations. The term genetics was first used by W.Bateson (1905).

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