1.4 Membrane Transport

Understandings:

• Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport

• The fluidity of membranes allows materials to be taken into cells by endocytosis or released by exocytosis

• Vesicles move materials within cells

Applications:

• Structure and function of sodium-potassium pumps for active transport and potassium channels for facilitated diffusion in axons

• Tissues or organs to be used in medical procedures must be bathed in a solution with the same osmolarity as the cytoplasm to prevent osmosis