What is the term used when vessels open and let more blood through?

Vasoconstriction

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Vasodilatation

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Increased permeability

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None of the above

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Solution

The correct option is A Vasodilatation
Vasodilation is the widening of blood vessels caused by relaxation of smooth muscles of the vessel walls. This lowers the blood pressure and may be triggered by intrinsic (local processes in the surrounding tissue) or extrinsic (hormones like adrenaline).

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