Complement proteins

A) can form holes in the plasma membrane of target cells.
B) are on the surface of macrophages.
C) are hormones found in the blood.
D) may cause the release of interferon.
E) do not attract neutrophils, monocytes, macrophages, or eosinophils.

Complement Proteins

Proteins in the blood that help or "complement" the immune system in destroying pathogens.

Plasma Membrane

The biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.

Target Cells

Specific cells affected by hormones or drugs due to the presence of particular receptors to which these substances bind.