Which of the Following Statements Regarding Phagocytosis is TRUE

Question

Which of the following statements regarding phagocytosis is TRUE?
A)Macrophages are the only phagocytes in human tissues.
B)The microbe engulfed by the phagocyte is killed by lysosomal enzymes and hydrogen peroxide.
C)Phagocytosis is controlled by a negative feedback mechanism whereby phagocytes release chemicals that inhibit further phagocytosis.
D)The microbe engulfed by the phagocyte is killed by the membrane attack complex (MAC).
E)Antibodies found inside lysosomes attack and kill microbes that are engulfed by phagocytosis.

Accepted Answer

The microbe engulfed by the phagocyte is killed by lysosomal enzymes and hydrogen peroxide. This is because after the phagosome fuses with the lysosome, the contents of the lysosome (including enzymes and reactive oxygen species such as hydrogen peroxide) kill the engulfed microbe.