Vocabulary (plasma membrane)

Semipermeability

Only some things can pass through the membrane.

Concentration Gradient

A difference in the amount of something across a space.

Diffusion

Molecules move from high to low concentration.

Facilitated Diffusion

Diffusion with help from a membrane protein.

Active Transport

Movement from low to high concentration using energy (ATP).

Glycocalyx

Sugar coating on the cell that helps with recognition and protection.

Sensitivity

The membrane responds to signals using receptors.

Dynamic Equilibrium

Equal amounts on both sides; molecules still move.

Osmosis

Water moves from low solute to high solute concentration.

Hypertonic

More solute outside; cell shrinks.

Hypotonic

More solute inside; cell swells.

Isotonic

Same solute inside and outside; cell stays the same.