Macrophages attack and destroy foreign substances to the body. Where does this action occur?
A) At the site of trauma
B) In the lymph node
C) In the vascular system
D) In the thymus
B
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As lymph passes through the node, macrophages attack and engulf foreign substances such as bacteria and viruses, abnormal body cells, and other debris. Options A, C, and D are incorrect.
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