Nervous system:It is a system of internal communication made up of nervous tissue. The nervous system of man consists of three components: 1.  Central Nervous System (C.N.S)        2.  Peripheral Nervous System (P.N.S)3.  Autonomic Nervous System (A.N.… more »

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. There are two types of hea… more »

Respiration is a process which involves the exchange of respiratory gases (co2 and O2) between the organism and external environment. There are two types of respiration 1.    DIRECT RESPIRATION –The specialized respiratory organs are absent. 2.  … more »

Digestion is a physiological process during which the food is mechanically and physiologically broken down in to simple molecules. These simple molecules are easily absorbed by the cells. The process by which the animals obtain food is called nutrition.… more »