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प्रश्न
Why are leucocytes classified as granulocytes and agranulocytes? Name each cell and mention its functions.
उत्तर
White blood corpuscles are colourless. They are nucleated cells. They are found in the bone marrow, spleen, thymus, and lymph nodes. They are grouped into two categories:
1. Granulocytes: They contain granules in their cytoplasm. Their nucleus is irregular or lobed. The granulocytes are of three types:
- Neutrophils: They are large in size and have a 2 – 7 lobed nucleus. Their numbers are increased during infection and inflammation.
- Eosinophils: It has a bilobed nucleus. Their numbers increases during conditions of allergy and parasitic infections. It brings about the detoxification of toxins.
- Basophils: Basophils have a lobed nucleus. They release chemicals during the process of inflammation.
2. Agranulocytes: Granules are not found in the cytoplasm of these cells. Thy is of two types:
- Lymphocytes: Lymphocytes produce antibodies during bacterial and viral infections.
- Monocytes: They are the largest of the leucocytes and are amoeboid in shape. They are phagocytic and can engulf bacteria.
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संबंधित प्रश्न
What are the components of blood?
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(c) Name one substance (other than oxygen) which is transported by tissue A in the human body.
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(e) Name any two organisms ( animals) which do not have liquid like A in their body.
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