Unit 2 - Cell transport

Diffusion

The net movement of particles from high to low concentration

Concentration Gradient

Physical differences in concentration of particles from low →high concentrations

Simple diffusion

Natural movement of small nonpolar substances from high → low concentration

*Passive

Osmosis def.

Movement of WATER through membrane

*passive

Facilitated diffusion

Movement WITH the concentration gradient high → low w/ the help of protein

Most molecules

*passive

Active transport

Movement against concentration gradient: low → high through proteins

Endocytosis

*Vesicle going into cell

→ phagocytosis: food/large molecules go in

→ pinocytosis: water goes in

Exocytosis

Vesicles leaving cell