Cell Transport Learning Objectives Explain how passive transport
Cell Transport
Learning Objectives § Explain how passive transport works. § Explain how active transport works. Vocabulary § Homeostasis-state of relatively constant internal conditions. § Diffusion-movement (passive, entropy) from a high concentration to a lower concentration. § Facilitated diffusion-protein channels in the membrane that help diffusion. § Aquaporin-water channel proteins in the membrane. § Osmosis-diffusion of water through a semipermeable membrane. § Isotonic-two solutions have the same concentration. § Hypertonic-higher concentration on the outside of the cell. § Hypotonic-lower concentration on the outside of the cell. § Osmotic pressure-movement of water into or out of cell due to concentration.
Passive Transport: Diffusion Solutes Outside Cell Membrane Inside Cell Higher concentration of solute on one side of the membrane than the other Diffusion causes net movement of solute particles from the side of the membrane with the higher solute concentration to the side with the lower solute concentration. At equilibrium, particles move equally in both directions, so there is no net change.
Passive Transport: Facilitated Diffusion
Passive Transport: Osmosis aquaporin sugar water cell membrane
Osmosis
Osmosis in Cells Isotonic Hypertonic Hypotonic
Active Transport Protein pumps Endocytosis Exocytosis
Endocytosis
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