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Fellainis_Elbows t1_iy832rq wrote

Most of your total vasculature is in the peripheries / not in the great vessels.

Widespread vasoconstriction therefore preferentially forces blood away from the peripheries and towards the heart.

This results in increased preload.

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WebW3b OP t1_iy89npn wrote

I see, so vasoconstriction squeezes the blood cells that was initially unable to reach the heart due to low blood pressure and Thereby increasing preload?

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Fellainis_Elbows t1_iy8elyj wrote

Mostly right. The more technical explanation is that blood is squeezed from the arterial space into the venous space. Veins return blood to the heart -> therefore increased preload

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