Macrophages are a type of white blood cell that play a crucial role in the immune system by engulfing and digesting cellular debris, foreign substances, microbes, cancer cells, and anything else that does not have the types of proteins specific to healthy body cells on its surface, in a process called phagocytosis.

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Macrophages

Question 39

Multiple Choice

Macrophages

A) are large, ciliated cells found in tears, saliva, and mucus.
B) phagocytize invading microbes
C) produce proteins that digest bacterial cell walls.
D) release chemicals that initiate blood clotting.
E) cannot squeeze through capillary walls.

Correct Answer: