BRAINCAKECo-transport in Absorption
On the membrane of the epithelial cell adjacent to the blood the sodium-potassium pump removes sodium from the epithelial cell lowering its concentration inside the epithelial cell.
On the membrane adjacent to the lumen the co-transport protein allows the passage of sodium into the cell by facilitated diffusion.
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Key terms in this lesson
- diffusion
- The net passive movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
- facilitated diffusion
- The passive movement of molecules or ions down their concentration gradient through protein channels or carrier proteins.
More in Transport Across Cell Membranes
- Osmosis
- Osmosis in Animal Cells
- Osmosis in Plant Cells
- Active Transport
- Sodium-Potassium Pump
- Increasing the Rate of Movement across a Membrane
- Absorption in the Ileum
- Oral Rehydration Therapy
All 22 lessons in Transport Across Cell Membranes · All AQA AS-level Biology topics