easy · MCAT bio-biochem
Anaphylaxis is a severe systemic allergic reaction triggered by the rapid release of histamine.
Which of the following best explains why blood pressure collapses during this crisis?
- Histamine causes widespread systemic vasoconstriction and sharply decreases capillary permeability throughout the body.
- Histamine causes widespread vasodilation and increased capillary permeability, leading to fluid loss from the circulation.
- The heart rate slows down to extremely low levels, entirely failing to maintain adequate cardiac output during the reaction.
- Circulating antibodies directly bind to and neutralize the epinephrine released by the adrenal glands during the stress response.
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