1. Blood contains plasma, erythrocytes, leucocytes and thrombocytes.
2. 4.5-5 million erythrocytes can be found in each cubic millimeter.
3. These cells are made in the bone marrow.
4. Their function is transporting oxygen from the lungs through the blood steam to the cells all over the body. They also carry away carbon dioxide.
5. Hemoglobin helps in carrying the oxygen as it travels through the blood steam.
6. There are two types of leucocytes: granulocytes and agranulocytes.
7. Agranulocytes are produced in lymph nodes and spleen.
8. There are three types of granulocytes: eosinophils, basophils and neutrophils.
9. Bone marrow forms thrombocytes.
10. In one cubic millimeter there are 400,000 platelets.
11. The plasma is the fluid portion before cloting has occurred and the serum is the fluid portion of blood remaining after the coagulation process is completed.