Blood is a red coloured fluid composed of two parts-the plasma and different types of cells that remain suspended in the plasma.
The composition of blood is as follows :
A. Cells :
(i) Red blood cells that act as the carriers of oxygen
(ii) White blood cells that fight bacteria
(iii) Platelets or thrombocytes that help in the formation of blood clots
B. Plasma :
(ii) Mineral salts such as sodium, calcium, potassium, magnesium, Phosphorus, etc.
(iii) Proteins such as albumin, fibrinogen, etc.
(vi) Other bodies
In order to understand the effects of exercise on our circulatory system, it is important to know the meaning of some of the terms used in our study, i.e., blood pressure, pulse rate, stroke volume, cardiac output, etc.