First slide

Blood

Question

Which of the following is the function of the least abundant leucocytes?

Moderate

A

Phagocytosis of the foreign agents.
B

Secretion of histamine and serotonin.
C

Resistance of the allergic reactions.
D

Provision of cell mediated immunity.

Solution

The least abundant leucocytes are basophils (0.5-1%). Basophils secrete histamine, serotonin, heparin, etc., and are involved in inflammatory reactions.
Neutrophils (60-65%) and Monocytes (6-8%) - Phagocytosis of the foreign agents.
Eosinophils (2-3%) - Resistance of the allergic reactions.
Lymphocytes (20-25%) - Provision of cell mediated immunity.

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