Natural killer cells destroy target cells by:

A) releasing antibiotics, which break down the cell membranes.
B) releasing cytokines and enzymes that trigger apoptosis.
C) releasing histamine, which signals other blood cells to aggregate.
D) phagocytosis, after the cells are targeted by antibodies.
E) releasing lysosomal enzymes, which digest the target cells.

Cytokines

A broad category of small proteins that are important in cell signaling, playing roles in the immune system's responses to disease and injury.

Apoptosis

Programmed cell death, a process that allows cells to die in a controlled manner, removing unnecessary or damaged cells.

Antibiotics

Chemical substances produced by certain microorganisms or synthesized, used to kill or inhibit the growth of bacteria and treat bacterial infections.