Why does anaphylactic shock rapidly decrease blood pressure during a severe allergic reaction to peanuts?

💡 Explanation

Anaphylactic shock causes rapid hypotension because systemic mast cell degranulation releases large amounts of histamine and other mediators, leading to vasodilation and increased vascular permeability. Therefore, blood pressure plummets due to decreased peripheral resistance, rather than increased red blood cell production or enhanced baroreceptor sensitivity.

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