This does not require a supply of energy because diffusion is a spontaneous process. This occurs when molecules are moved across the cell membrane from an area where they are at a low ...

Second, we must remember that diffusion is one ... So, if the cell membrane were a lipid, how would it be organized? In 1890, Rayleigh, working on simple oils, showed that they tend to spread ...

Diffusion is the movement of particles from ... and is one of the ways substances can move across the cell membrane, into or out of the cell. Products of digestion, dissolved in water, can pass ...