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Practice MCAT Question - Q123 - Answer!

One of the ways that HIV causes AIDS is by infecting those cells that coordinate the body’s defenses against pathogens. Which cells of the immune system does HIV infect?

A.  Cytotoxic T-cells
B.  Helper T-cells
C.  Plasma cells
D.  Memory B-cells

The correct answer is (B). Helper T-cells (one of the primary host cells for HIV) help coordinate the complete immune response by stimulating B-cells (antibody-mediated immunity), macrophages, and T-cells (cell-mediated immunity). Although cytotoxic T-cells help battle infections, plasma cells produce antibodies, and memory cells provide long-term protection, it is the helper T-cells that bring all forces together.

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