Identify the human blood cell with its characteristics.

B-lymphocyte - Forms 20% of blood cells, involved in immune response

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Neutrophil - Most abundant blood cell, phagocytic

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Monocyte - Life span 3 days, produces antibodies

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Basophil - Secretes serotonin inflammatory response

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Solution

The correct option is D Basophil - Secretes serotonin inflammatory response
The given diagram shows a basophil cell which is a granulocyte i.e. a type of leucocytes or white blood cells (WBCs) which contain granules. Basophil cells have a S-shaped or twisted nucleus. These are least numerous WBCs in blood. They make 0.5- 2.7% of total leucocytes. These cells secrete histamine, serotonin and heparin. Thus, these cells also regulate allergic and inflammatory responses in body.
So, the correct answer is 'Basophil - Secretes serotonin inflammatory response'.

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Match the given cells with their characteristics.
$\begin{matrix} Column I & Column II (i) Monocyte & (a) secretes serotonin, histamine, heparin (i i) Neutrophil & (b) forms about 20% of WBC is involved in immune response (i i i) B-Lymphocytes & (c) most abundant white blood cells, phagocytic (i v) Basophil & (d) life span of 3 days, produces antibodies \end{matrix}$

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