facilitated diffusion

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larger molecules and charged particles would diffuse very slowly through the membrane, so they diffuse via facilitated diffusion, through channel or carrier proteins
particles still move down a concentration gradient - higher to lower
passive process
charged particles are water-soluble, and the centre of the bilayer is hydrophobic
carrier proteins move large molecules across membranes
different carrier proteins facilitate the diffusion of different molecules
carrier proteins - a molecule attaches to the protein at a binding site. this causes the protein to change shape, which releases the molecule on the other side of the membrane
channel proteins - form pores in the membrane for the charged molecules to diffuse through. different channel proteins facilitate the diffusion of different particles

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facilitated diffusion

Cards (8)

1.1.5 Movement Across Cell Membranes

1.1 Cells and Movement Across Membranes

2.1 Movement Across Membranes

2.2 Cell Membranes

2.7 Facilitated Diffusion

3.2 Cell Membranes and Transport

1.1.3 Cell Differentiation

1.1.1 Cell Structure

2.4 Transport Across Membranes

2.2 Cell Division and Stem Cells

OCR A-Level Biology

1.3.1 Diffusion

1.3.1 Diffusion

1.3.1 Diffusion

1.1.4 Microscopy

Unit 1: Cell Biology

1.1.2 Specialised Cells

2.4 Plasma Membranes

AQA A-Level Biology

3.8 Effects of Diffusion

Unit 1: Cell Biology