A key difference between cellular and humoral immunity is that
A) cellular immunity destroys pathogens outside the cell, whereas humoral immunity destroys pathogens inside the cell.
B) cellular immunity destroys pathogens inside the cell, whereas humoral immunity destroys pathogens outside the cell.
C) Cellular immunity is a nonspecific immunity, whereas humoral immunity is a specific immunity.
D) Cellular immunity focuses on pathogens on the body's surface, whereas humoral immunity focuses on pathogens in the body's interior.

Question

Quizplus · Accepted Answer

Cellular immunity is carried out by T-cells, which recognize and destroy infected cells by directly attacking them. This is why cellular immunity is effective against pathogens that have already invaded host cells. On the other hand, humoral immunity is carried out by B-cells, which produce antibodies that can neutralize pathogens that are circulating in the body fluids (i.e. outside the host cells). Therefore, humoral immunity is effective against extracellular pathogens.

A Key Difference Between Cellular and Humoral Immunity Is That