Short note on :Erythrocytes.

1.	Short note on :Erythrocytes.
Answer» 1. Erythrocytes or red blood corpuscles. They are circular, biconcave, enucleated cells. 2. The RBC size : 7 pm in diameter and 2.5 pm in thickness. 3. The RBC count : 5.1 to 5.8 million RBCs/ cu mm of blood in an adult male and 4.3 to 5.2 million/cu mm in an adult female. 4. The average life span of RBC : 120 days. 5. RBCs are formed by the process of erythropoiesis. In foetus, RBC formation takes place in liver and spleen whereas in adults it occurs in red bone marrow. 6. The old and worn out RBCs are destroyed in liver and spleen. 7. Polycythemia is an increase in number of RBCs while erythrocytopenia is decrease in their (RBCs) number. Functions of RBCs: 1. Transport of oxygen from lungs to tissues and carbon dioxide from tissues to lungs with the help of haemoglobin. 2. Maintenance of blood pH as haemoglobin acts as a buffer. 3. Maintenance of the viscosity of blood.

Answer»

1. Erythrocytes or red blood corpuscles. They are circular, biconcave, enucleated cells.

2. The RBC size : 7 pm in diameter and 2.5 pm in thickness.

3. The RBC count : 5.1 to 5.8 million RBCs/ cu mm of blood in an adult male and 4.3 to 5.2 million/cu mm in an adult female.

4. The average life span of RBC : 120 days.

5. RBCs are formed by the process of erythropoiesis. In foetus, RBC formation takes place in liver and spleen whereas in adults it occurs in red bone marrow.

6. The old and worn out RBCs are destroyed in liver and spleen.

7. Polycythemia is an increase in number of RBCs while erythrocytopenia is decrease in their (RBCs) number.

Functions of RBCs:

1. Transport of oxygen from lungs to tissues and carbon dioxide from tissues to lungs with the help of haemoglobin.

2. Maintenance of blood pH as haemoglobin acts as a buffer.

3. Maintenance of the viscosity of blood.

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