THE HUMAN BLOOD
2. Red Blood Corpuscles (RBC)
3. White Blood Corpuscles (WBC)
1. Plasma: Plasma is a colourless liquid which consists of water and many substances like proteins, digested food etc are dissolved in it. RBC, WBC and platelets are immersed in it. Plasma also carries carbon dioxide in dissolved form.
2. Red Blood Corpuscles (RBC): Red blood cells are small cells without nucleus. It carries oxygen from lungs to different parts of body. It contains haemoglobin (Respiratory pigment). Red blood cells are red in colour due to the presence of haemoglobin. Haemoglobin has the higher affinity of oxygen. So due to the presence of haemoglobin in it, RBC is able to carry oxygen from lungs to body tissues. It also carries some carbon dioxide but major part is carried by plasma. RBC is a non – nucleated cell. RBC is made in bone marrow.
3. White Blood Corpuscles (WBC): WBC builds immune system in our body. WBC are soldiers of our body as they protect body from the attack of disease causing germs (pathogens) and other harmful foreign materials. WBC is a nucleated cell. WBC in the blood are much smaller in number than the RBC.
4. Platelets: Platelets are the tiny fragments of special cells formed in the bone marrow. It helps in the clotting of blood(coagulation of blood).