Lesson 1: Cell Transport and Permeability

simple diffusion is limited by __.

pore size, molecule size.

passive.

Facilitated Diffusion

requires a transporter.

passive, down conc. gradient.

Factors affecting membrane permeability: __,__,__

Solute size, membrane pore size, lipid solubility

Osmosis

driven by conc. gradients (transport of water, water moves toward solutes).

water moves from High water conc (low solute) to Low water conc (high solute).

Factors affecting rate of diffusion: __, __, __.

concentration gradient, # of solutes, # of membrane carriers.

if solute conc. increases, water concentration __.

decreases

Hypertonicity/shrinking of the cell is caused by __.

Higher conc. of impermeable solutes outside than inside, makes gradient.

Water → out of cell (causes cell to shrink)

Hypotonicity/swelling of the cell is caused by __.

Lower conc. of impermeable solutes outside than inside, makes gradient.

Water → into cell (causes cell to swell)

Filtration is drive by __, but limited by __.

pressure gradient, membrane pore size

Active transport

requires a transporter and ATP, works against concentration gradient.

rate is affected by number of pumps available.