some substances are absorbed into the ca[pillaries by active uptake.
explain why active uptake is sometimes necessary?
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Particles in a liquid and a gas move continuously. Because of this movement, particles will spread themselves evenly throughout a liquid or a gas.
If there is a situation where particles of a substance are in a higher concentration, they will therefore move from this region to where they are in a lower concentration. This is called diffusion.
It is important to remember that the particles:
will move in both directions, but there will be a net movement from high to low concentration
will end up evenly spread throughout the liquid or gas but will continue to move
Explanation:
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