Question

The process of formation of blood corpuscles is called
A. Haemopoiesis
B. Hemolysis
C. Hemozoin
D. None of the above

Answer 1

Haematology is the study of blood and the formation of blood cells is called hematopoiesis. It is mainly formed in the liver, bone marrow and spleen. RBCs are destroyed in the spleen (the graveyard of RBCs).

Complete answer:
Haemopoiesis is the production of all the cellular components of the blood and blood plasma. It occurs within the hematopoietic system, which includes organs and tissues such as bone marrow, liver and spleen. Haemopoiesis can be subdivided according to the type of cells being formed, for example;
a) Erythropoiesis: formation of red blood cells.
b) Thrombopoiesis: formation of platelets.
c) Leucopoiesis: formation of white blood cells.
d) Granulopoiesis: formation of granulocytes.
Blood cell types mainly fall into three categories:
1. Erythrocytes: These are the most abundant of all the cells in the human body. An ordinary grown-up man and woman have 5-5.5 and 4.5-5 million RBCs for every cubic millimetre in the blood respectively. RBCs are biconcave, circular and devoid of the nucleus. They have a red coloured iron-containing complex protein called haemoglobin pigment. The life cycle of RBC is about 120 days.
2. Leucocytes: It is also known as WBCs as they do not have haemoglobin, so are colourless. The number of WBCs varies from 6000 to 8000 per cubic mm of blood in humans. They are generally short-lived. Leucocytes are isolated into two classes granulocytes and agranulocytes.
3. Blood platelets or thrombocytes are non-nucleated colourless cell fragments. They are formed in bone marrow from large nucleated cells called megakaryocytes. Their number is 150000-350000/cubic mm. They have a life expectancy of about seven days. They release a variety of substances most of which are involved in the clotting of blood.

So, the correct answer is option A.

Note: Hemolysis is the destruction or rupturing of RBCs and the release of their contents into the surrounding fluid. Hemozoin is a product formed by the digestion of blood in blood-feeding parasites.