it takes 5 seconds for a nutrient to diffuse from the blood to a cell which is 100 micrometers from the nearest capillary.
Capillaries are small blood vessels lined of a single layer of endothelium. The exchange of gases and nutrients that take place between the blood and tissues is the function of the capillaries. Oxygen from the red blood cell and nutrients in the blood diffuses into the tissues, while carbon dioxide from the tissues diffuses out into the blood. The carbon dioxide is then transported to the lungs, where it will be exhaled.
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