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No cell in your body is further than 0.05mm away from a capillary. Capillaries are [narrow] with very [thin] walls to reduce the [diffusion] distance between the blood and the respiring cell. This also allows products formed in the cells to easily [diffuse] into the [bloodstream]. The [lumen] diameter of the capillary is slightly larger than the diameter of a [red blood cell]..

Gap fill capillaries


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