Q9 : Why is blood needed by all the parts of a body?

Blood is needed by all the parts of a body because :

(1) It supplies the oxygen and digested food to various parts of the body to provide essential energy to them which helps the body to perform various functions.

(2) To expel out carbon dioxide from our body.

(3) To transmit heat thus helping in the regulation of body temperature.

(4) It is required to fight out infections and diseases.