Discussion
Which of the following is involved in the immune system of human body ?
Answer: B
The cells involved in the immune system are the leucocytes.
White blood cells defend the body. Neutrophils and monocytes engulf microorganisms, lymphocytes provide specific immunity (B cells make antibodies and T cells kill infected cells and coordinate the response), and eosinophils and basophils take part in allergic and parasitic responses.
Erythrocytes carry oxygen, and thrombocytes (platelets) are concerned with clotting. Serum carries antibodies made by B lymphocytes, but it is the fluid left after clotting, not the immune cells themselves, which is why the leucocytes are the answer.
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