Ch. 7 Transport of Ions and Small Molecules Across the Cell Membrane

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Presentation transcript:

Ch. 7 Transport of Ions and Small Molecules Across the Cell Membrane Megan Goertz

Passive Diffusion Gases, such as O2 & CO2, small uncharged polar molecules, urea & ethanol readily move by passive diffusion. Very few molecules and no ions can cross a pure phospholipid bilayer at appreciable rates by passive diffusion

- Use energy of ATP hydrolysis Active Transport ATP-powered pumps - Use energy of ATP hydrolysis

Facilitated Diffusion Channel proteins transport water or specific types of ions and hydrophilic small molecules down their concentration gradient

Transporters (Carriers) Uniporters - transport a single molecule via facilitated diffusion

Transporters (cont’d) Cotransporters – Antiporters & Symporters - couple the movement of one type of ion or milecule against it’s concentration gradient

Thank You