BRAINCAKEInvestigating the Rate of Respiration
The rate of aerobic respiration can be measured with a respirometer, which measures the rate of oxygen uptake by small organisms such as woodlice, maggots or germinating seeds.
How it works:
• The organisms sit on a gauze platform above soda lime (or potassium hydroxide solution), which absorbs the carbon dioxide they give out.
• As the organisms take in oxygen, the volume of gas in the tube falls, so a drop of coloured liquid in the capillary tube moves towards the organisms.
• A control tube with glass beads of the same volume as the organisms compensates for changes in temperature and atmospheric pressure.
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More in Cellular Respiration
- Aerobic Respiration
- Respiration in the Cytoplasm
- Mitochondria
- Hydrogen Acceptors
- Investigating the Site of ATP Synthesis
- Glycolysis
- Anaerobic Respiration in Mammals
- Lactate
All 20 lessons in Cellular Respiration · All Edexcel A-level Biology topics