how are blood vessels under the feet not compressed to the point of blockage when standing?
In: 925
Wow so many wrong answers. Whew.
The correct answer is that there’s this thing called the hydrostatic effect – the taller a column of fluid, the greater the pressure at the bottom. So the normal systolic blood pressure in your feet is usually 200 or higher, compared to the “normal” reading of 120 at the level of your heart. This pressure is enough to overcome the compressive forces on the soles of your feet and perfuse the tissue.
The *many* wrong responses that you “shift your weight” don’t know what they’re talking about. That’s something you don’t utilize the skeletal muscle pump to increase venous return since veins are highly compliant. People pass out when they lock their knees because that requires sustained muscle contractions (instead of rhythmic contractions), and de-activates the skeletal muscle pump.
And the “lactic acid causes pain and hives you he’d sores” is maybe the strongest thing I’ve read today. That’s impressive.
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