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The resistance offered by the peripheral circulation is known as the systemic vascular resistance (SVR). Vasoconstriction (i.e., decrease in blood vessel diameter) increases SVR, whereas vasodilation (increase in diameter) decreases SVR. this constriction and dialation decreases or increases the volume in which the vessles can potensially hold. the blood pressure is subsequantly altered as more or less vascular space is provided.

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Q: Hoe does SVR affect blood pressure?
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