Copy of TWC - Cellular Transport 1_2025

Facilitating communication between cells

Regulating movement of materials in and out of the cell

Producing energy for the cell

Using receptors to recognize specific molecules

Large polar molecules

Small nonpolar molecules

Ions

Proteins

Small nonpolar molecules can pass freely through the lipid bilayer.

Large polar molecules require proteins to move through the membrane.

Aquaporins help move water molecules across the membrane.

Ions can pass through the membrane without any help.

Diffusion

Osmosis

Facilitated diffusion

Endocytosis

Oxygen

Glucose

Water

Carbon dioxide

All sugar is evenly distributed throughout the water

Active transport

Facilitated diffusion

Osmosis

Simple diffusion

Diffusion involves solute molecules moving from high to low concentration.

Osmosis involves solvent molecules moving from low to high solute concentration.

Both processes reach equilibrium.

Osmosis requires a semipermeable membrane.