Discussion
Which of the following is involved in human body's immune system ?
Answer: A
The white blood cells are involved in the immune system of the human body, option A. Lymphocytes, neutrophils, monocytes and the other leucocytes recognise and destroy foreign organisms and make antibodies. The red cells (B) carry oxygen, the thrombocytes, or platelets (C), take part in clotting, and serum (D) is the fluid left after clotting, which contains antibodies but is not itself a cell of the defence system, so the key takes the white cells as the answer. The white cells include the lymphocytes, which make antibodies and carry out cell-mediated immunity, and the phagocytes, which engulf foreign particles.
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