# Carbon dioxide is produced during respiration in muscle cells and diffuses into the blood. Describe the factors that determine how quickly carbon dioxide diffuses out of a muscle cell.

> Cambridge International IGCSE Biology (0610) — 3.1 Diffusion · Describe · 4 marks

## Mark scheme (4 marks)

1. A greater concentration gradient increases the rate of diffusion
2. A larger surface area of the cell membrane increases the rate of diffusion
3. A shorter diffusion distance increases the rate of diffusion
4. Higher temperature increases the rate of diffusion

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