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प्रश्न
State briefly, the difference between white blood cells and the red blood cells.
उत्तर
Difference between white blood cells and the red blood cells:
| RBC | WBC |
| 1. They do not have nucleus at maturity. | 1. They have a large characteristic nucleus. |
| 2. They possess haemoglobin and are red. | 2. They are colourless as they have no pigment. |
| 3. They help in transport of respiratory gases. | 3. They help in defence mechanism. |
| 4. Life span is 120 days. | 4. WBC have a short life span of 5 to 20 days. |
| 5. They are about 5 million/mm3 of blood. | 5. They are about 7000/ mm3 of blood. |
| 6. In the embryonic stage the RBC are formed in the liver and spleen. But after birth, they are formed in the red bone marrow. | 6. WBC are formed in the red bone marrow. |
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