The most important means by which capillary exchange occurs is by diffusion.
What is Simple diffusion?
Simple diffusion is a type of passive transport of substances across the cell membrane. It is a process that occurs from the region where the particles are more concentrated to regions where their concentration is lower, until an equilibrium in the concentrations is reached. Thus, diffusion occurs in favor of a concentration gradient. With this, there is no energy expenditure and no need for a carrier for the substances.
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