Slow blood flow in the capillaries helps increase the efficiency of diffusion. The thin capillary wall also helps with diffusion.
Capillaries have slow flow. This slow speed maximizes opportunities of diffusion of oxygen, nutrients, and wastes.
The flow of lymph is slow because the lymphatic system has no pump.
Capillaries do not have valves to regulate blood flow. Veins are the vessel of the circulatory system that have veins to regulate blood flow.
Blood does not move faster through the capillaries. Blood flow is slowest in the capillaries.
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Capillaries
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The capillaries flow from an artery to a vein.
From the capillaries, blood will flow into the veins and pump the un-oxygenated blood back to the heart.
Veins are where the blood flow is the slowest. Blood flow velocity decreases from the aorta to the arteries to capillaries.
The narrow diameter of capillaries maximizes opportunities for diffusion of oxygen, wastes, and nutrients into and out of the blood from the body tissues. The slow speed of flow also facilitates diffusion.