Lymphocytes are made up of B cells and T cells. B cells:
a. mature in lymphoid tissue.
b. mediate humoral immunity.
c. migrate to the thymus gland.
d. destroy virus-infected cells.
B
Lymphocytes are responsible for specific immune responses and participate in two types of immunity: humoral immunity, which is mediated by B lymphocytes; and cellular immunity, which is mediated by T lymphocytes. B lymphocytes, or B cells, originate in the bone marrow and are also thought to mature there. B cells perform in antibody production. T cells are produced in the bone marrow, but they migrate to the thymus for maturation; then, most of them travel and reside in lymphoid tissues throughout the body. They live longer than B cells and participate in long-term immunity. The natural killer cell is a third type of lymphocyte, thought to be a differentiated form of the T lymphocyte. It is responsible for surveillance and destruction of virus-infected and malignant cells.
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