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प्रश्न
Write a note on erythrocytes.
उत्तर
RBC (Red Blood Corpuscles) or Erythrocytes:
- Erythrocytes are circular, biconcave and non-nucleated cells.
- Their diameter is 7μ and are 2.5μ thick.
- In adult male, RBC count is 5.1 to 5.8 million per cubic millimeter, while in female, it is 4.3 to 5.2 million per cubic millimeter.
- Normal life span of a single RBC is about 120 days.
- Formation of RBCs is called erythropoiesis.
- Erythropoiesis in foetus, takes place in yolk sac, kidney, spleen and liver while in adults, it takes place in red bone marrow.
- Stroma of RBC contains haemoglobin which helps in carrying respiratory gases.Old and worn out RBCs are destroyed in spleen and liver
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संबंधित प्रश्न
A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.
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(b) How do you think this injection would protect the patient against the disease?
(c) Name the disease against which this injection was given and the kind of immunity it provides.
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______ is secreted by killer T - cells.
On coming in contact with an antigen, a sensitized T-lymphocyte produces ____________.
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