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Diffusion

Small molecules or ions can move across the cell membrane without input of energy by the cell.

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Vocabulary

concentration gradient

Difference in the concentrations of a molecule across two distinct areas, such as a cell membrane.

diffusion

Movement of a molecule from an area of high concentration of the molecule to an area with a lower concentration.

equilibrium

State of equal concentration of a molecule, such as on both sides of the cell membrane.

passive transport

Movement of substances across a plasma membrane that does not require energy.

selectively permeable

The ability to allow only certain molecules to cross the plasma membrane; semipermeable.

semipermeable

The ability to allow only certain molecules to cross the plasma membrane; selectively permeable.

hydrophilic

Water-loving.

hydrophobic

Water-hating.

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