An Inflammation-Causing Signal Released by Mast Cells at the Site

Question

An inflammation-causing signal released by mast cells at the site of an infection is
A) an interferon.
B) lymphatic fluid.
C) histamine.
D) mucus.
E) sodium ions.

Accepted Answer

Mast cells release histamine, which causes vasodilation and increased permeability in blood vessels, allowing immune cells to migrate to the site of infection and initiate an inflammatory response.

Answer: A, D, E are incorrect. Interferons are released by infected cells to signal neighboring cells to prepare for viral attack. Mucus is produced by goblet cells to protect and lubricate surfaces in the body. Sodium ions are electrolytes involved in nerve and muscle function, but not specifically related to inflammation caused by mast cells.