The table lists some structures that provide specialized surfaces for the exchange or uptake of substances.
Complete the table by naming the organ in which each structure is found. The first one has been done for you.
| Structure | Organ |
|---|---|
| guard cell | leaf |
| gill lamella | |
| chorionic villus | |
| microvillus |
What is meant by the term facilitated diffusion?
Epithelial cells in the small intestine are involved in the uptake of glucose.
Describe how glucose molecules are absorbed from the lumen of the small intestine into these epithelial cells when the concentration of glucose is higher in the lumen than inside the cells.
23 exam-style questions on Edexcel IGCSE Biology Movement of substances into and out of cells. Each one has a worked solution and a mark scheme showing where the marks go.