Question

The epithelial cells that line the small intestine are adapted for the absorption of glucose. Explain how. ( 6 marks)

Accepted Answer

1. Microvilli;

2. Large/increased surface area;

3. Many mitochondria;

4. (Mitochondria/respiration) produce ATP / release or provide energy (for active transport);

5. Carrier proteins for active transport;

6. Channel / carrier proteins for facilitated diffusion;

7. Co-transport of sodium (ions) and glucose or symport / carrier protein for sodium (ions) and glucose;

8. Membrane-bound enzymes digest disaccharides / produce glucose;

Carrier Produce Active Proteins Sodium Ions Epithelial Cells