Glucose can diffuse from the small intestine into the blood.
A sample of the lining of the small intestine contains villi. The table gives information about the sample.
| Measurement | Value |
|---|---|
| Number of villi in the sample | 500 |
| Mean exposed surface area of one villus in mm2\text{mm}^2mm2 | 1.2 |
| Total exposed surface area of the villi in mm2\text{mm}^2mm2 | ? |
Calculate the missing value in the table.
A villus has a thin lining and a rich blood supply. Explain how each of these features increases the rate at which glucose diffuses into the blood.
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.