Diffusion plays a huge role in making this happen. Diffusion is in charge of spreading the molecules in a certain space. Usually, diffusion starts to occur from one place wherein there is a high concentration of molecules going to a place with low concentration.
This only happens when there is enough space for the molecules to move around. Diffusion cannot happen among solids because they are usually very packed. This means that there is no space to move around. Diffusion also happens in the human body. For example, air can move around the lungs and can go in and out of the lungs with ease. Digestion will also involve diffusion.
Diffusion-particles move from an area of greater osmolarity to one of lesser osmolarity through diffusion. active transport is the movement of particles though energy expenditure from other sources such as enzymes. osmosis is the movement of a pure solvent through a semipermeable membrane from an area of greater osmolarity to one of lesser osmolarity until equalization occurs. the membrane is impermeable to the solute but permeable to the solvent. filtration is the process by which fluid is forced through a membrane by a difference in pressure; small molecules pass through, but large ones dont.
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