An inflammatory response is triggered when
A) red blood cells release pyrogens.
B) T lymphocytes release interferon.
C) mast cells release granules containing histamine and heparin.
D) neutrophils phagocytize bacteria.
E) blood flow to an area increases.

Question

Quizplus · Accepted Answer

Inflammatory response begins when damaged tissues or invading pathogens activates resident immune cells, such as mast cells. Mast cells then release granules containing histamine and heparin, which trigger increased blood flow to the area, causing redness and warmth, as well as increased permeability of blood vessels, which allows immune cells such as neutrophils to migrate into the affected area to phagocytize pathogens. Red blood cells do not release pyrogens, T lymphocytes release interferon in response to viral infections, and increased blood flow is a result of the inflammatory response, not a trigger for it.

An Inflammatory Response Is Triggered When