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प्रश्न
Differentiate between:
Red blood cells and White blood cells
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उत्तर
| Red blood cells | White blood cells. |
| These are minute biconcave disc like structures, flat in centre, thick and round at the periphery and nuclei are absent in mature RBCs. | These collect blood from different organs of the body. |
| These contain a respiratory pigment haemoglobin. | Haemoglobin is not present. |
| RBCs help in the transport of oxygen and CO2. | WBCs help in the protection of the body against infections from the germs. |
| The number of RBCs in an adult male is 5 million per cu. millimeter. | Their number is usually about 4000-8000 per cubic millimeter. |
| Their average life span is about 120 days. | Their average life span is about two weeks. |
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संबंधित प्रश्न
Describe, in brief, the circulatory system in human beings.
Differentiate between members of the following pairs with reference to the aspect asked within bracket:
artery and vein (type of blood primarily flowing through)
Give reason for the following:
The blood groups of both the donor and recipient must be known before transfusing blood.
Give reason for the following:
The arteries are deep seated in the body
Put a tick mark (✓) against the correct alternative in the following statement.
The only artery which carries deoxygenated blood is called,
Give any three differences between an artery and a vein
Which side of the heart (left or right) contains oxygenated blood?
Complete the following sentence with appropriate word:
Beside food, oxygen and waste materials, circulatory system transports ________ to various parts of the body.
Match the following.
| Group A | Group B |
| (1) Lungs | (a) Circulation |
| (2) Stomach | (b) Respiration |
| (3) Heart | (c) Co-ordination |
| (4) Brain | (d) Digestion |
Blood is produced in the bone marrow.
