Substances move into and out of cells across selectively permeable membranes via different transport mechanisms.
Complete the table by identifying the primary cellular transport process responsible for each described movement of substances.
| Description of substance movement | Transport process |
|---|---|
| Carbon dioxide moving from respiring muscle cells into blood capillaries | |
| Sodium ions being moved out of an animal cell into extracellular fluid where the concentration of sodium is much higher | |
| Water moving from a dilute solution into a highly concentrated surrounding tissue fluid |
Explain how the structure of the gills in a bony fish is adapted for the efficient exchange of gases.
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.