Because most veins must carry blood against gravity, one-way valves prevent blood from flowing backward in the veins. Because skeletal muscle activity promotes venous blood flow, it is critical to get up and walk around regularly after sitting for lengthy periods of time so that blood does not pool in the extremities. The sluggish rate of travel via the capillary beds, which reach practically every cell in the body, aids in gas and nutrition exchange as well as fluid diffusion into the interstitial space. The rate of flow increases again once the blood has gone from the capillary beds to the venules, veins, and eventually to the major venae cavae, although it is still much slower than the original pace.
What is the blood vessel with valves to allow one-way blood flow?
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