Question

As mentioned previously, the second line of defense is activated when the first line of defense fails. In Part A, you identified one of these defenses as inflammation, which occurs when the body responds to a foreign antigen and increases fluid accumulation in a specific area. An added benefit of this excess fluid is that it also brings immune cells to the area to aid clearance of foreign antigens. In Julie’s situation, that added fluid would bring immune cells to prevent any microbial infections that could be caused if microbes were introduced when she cut her finger. Which of the following cell types is NOT part of the second line of defense?

A - eosinophils
B - mast cells
C -basophils
D - B cells

Answer 1

B cells are not part of the second line of defense in the immune system.

Step-by-step explanation:

The cell type that is NOT part of the second line of defense is B cells. The second line of defense in the immune system includes cells such as eosinophils, mast cells, and basophils, all of which play a role in the inflammatory response. Eosinophils are involved in killing parasites, mast cells release chemicals that trigger inflammation, and basophils release chemicals involved in the allergic response. However, B cells are not part of the second line of defense, but rather part of the adaptive immune response, which is the third line of defense.