The first defense cells that interact with a pathogen in the body are
A) T cells.
B) macrophages.
C) B cells.
D) mast cells.

Question

Quizplus · Accepted Answer

Macrophages are the first line of defense against pathogens in the body. They recognize and engulf the invading pathogen, presenting its antigen to other immune cells such as T and B cells to mount a specific response. T cells and B cells come into play later in the immune response. Mast cells are involved in allergic reactions and not specifically in the initial response to a pathogen.

The First Defense Cells That Interact with a Pathogen in the Body