The main components of blood are:

(i) Plasma: It carries all the dissolved substances such as proteins, digested food, common salt etc. from one part to another part of the body.

(ii) Red blood corpuscles (RBC): It carries oxygen from the lungs to all the cells of the body.

(iii) White blood corpuscles (WBC): It fights infection and protects us from diseases.

(iv) Platelets: It helps in the coagulation of blood in a cut or wound.