OpenStudy (anonymous):

The sneezing, runny nose, and itchy eyes associated with allergies are caused when A. smooth muscles reduce the size of air passageways in the lungs. B. the immune system attacks the body’s own cells. C. mast cells release histamines. D. infected cells produce interferon.

6 years ago
OpenStudy (anonymous):

C. mast cells release histamines.

6 years ago
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