A large burn area predisposes to decreased blood pressure because:

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A large burn area can cause fluid and protein to leak out of the blood vessels, leading to a decrease in blood volume and, ultimately, a decrease in blood pressure. This is known as hypovolemia, and it can cause a drop in blood pressure that may require medical intervention. Bleeding under the burn surface or damage to the heart are possible complications of a burn, but they are not the primary cause of decreased blood pressure in this scenario. Vasoconstriction, or narrowing of the blood vessels, would actually increase blood pressure, so it is not a likely cause of hypotension in a burn patient.

A Large Burn Area Predisposes to Decreased Blood Pressure Because