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How blood flows to the heat when you lift your arms #science #cool #doctor
When you lift your arms above heart level, gravity helps pull blood out of the vessels in your hands and forearms. Since your heart no longer has to push blood uphill, the hydrostatic pressure in those vessels drops — meaning less blood pooling in the tissues and a quick change in color and fullness.⁣ ⁣ It’s the same reason your hands ...
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