Which of the following statements regarding phagocytosis is true?
A)Macrophages are the only phagocytes in the 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)None of these statements are true

Question

Quizplus · Accepted Answer

When a microbe is engulfed by a phagocyte, it is contained within a phagosome. Lysosomal enzymes and hydrogen peroxide are then released into the phagosome, where they kill the microbe. This process is called phagolysosome formation. The other statements are incorrect: A is incorrect because other cells, such as neutrophils, can also phagocytize microbes; C is incorrect because phagocytosis is not regulated by negative feedback, but rather is stimulated by the presence of microbes and other foreign particles; D is incorrect because the membrane attack complex is part of the complement system, which is a separate mechanism for destroying microbes.

Which of the Following Statements Regarding Phagocytosis Is True