BRAINCAKEDiffusion Across Membranes
Some particles are able to pass through the phospholipid bilayer.
These molecules are non-polar and can diffuse through the membrane down their concentration gradient.
Examples are oxygen and carbon dioxide which diffuse freely through the membrane.
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Key terms in this lesson
- phospholipid bilayer
- Two layers of phospholipid molecules arranged with hydrophilic heads facing outwards and hydrophobic tails facing inwards, forming the basic structure of cell membranes.
- diffusion
- The net movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
More in Plasma Membrane
- Sites of Chemical Reactions
- Effect of Temperature
- Solvents
- Diffusion
- Facilitated Diffusion
- Active Transport
- Bulk Transport
- Osmosis
All 18 lessons in Plasma Membrane · All OCR AS-level Biology topics