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| Question | Answer |
| Topic 3 | Respiration |
| Respiration is a chemical process which releases energy in living organisms | RESPIRATION IS NOT BREATHING! |
| aerobic respiration: | respiratory surfaces such as alveoli of lungs and leaves of a plant are adapted for gas exchange: |
| 1. large surface area - more opportunity for gases to be exchanged 2. thin - short diffusion distance 3. permeable - allows gases to pass through 4. moist - allows gases to dissolve 5. steep concentration gradient - blood supply | most of these characteristics are the same as the villi in the ileum (except moist) |
| anaerobic respiration: (humans) | to get rid of the lactic acid build up we tend to breathe faster (panting) and our heard beats faster |
| anaerobic respiration: (plants/yeast) | the examiners often use bread making to test your knowledge of this... |
| making bread: *cover the dough (containing yeast) *it will rise due to the carbon dioxide which is being produced rising *when you put it in the oven the ethanol produced is evaporated | experiment to show the carbon dioxide is produced during yeast respiration: |
| *the yeast is in glucose which is boiled to remove oxygen (as it has to respire anaerobically) and cooled so the yeast isn't killed *in the second test tube lime water would be put in as it is an indicator if carbon dioxide. it turns from colourless to cloudy | over time carbon dioxide will stop being released either because there is no glucose left to be broken down or there is a build up of ethanol which can become toxic and kill the yeast |
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