GCSE›Edexcel GCSE Biology›Mind mapsRespirationEdexcel GCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat is it?Exothermic: transfers energy to surroundingsReleased continuously in living cellsTwo types: aerobic and anaerobicRespiration is not the same as breathingAerobicNeeds oxygen, in the mitochondriaglucose+oxygen→carbon dioxide+water\ce{glucose + oxygen -> carbon dioxide + water}glucose+oxygencarbon dioxide+waterReleases a large amount of energyAnaerobicNo oxygen, less energyIncomplete breakdown of glucoseMuscles: glucose to lactic acidPlants and yeast: ethanol + CO₂ (fermentation)Respirationreleasing energyO₂CO₂After exerciseOxygen debt: extra oxygen needed after exerciseUsed to break down lactic acidHeavy breathing repays the debtCore practicalMeasure gas volume change with a respirometerSoda lime absorbs CO₂Use a control, e.g. glass beadsVary temperaturerate=volumetime\text{rate} = \frac{\text{volume}}{\text{time}}rate=timevolumeExam tipsMuscle anaerobic gives lactic acid, not ethanolAerobic happens in mitochondria, anaerobic in cytoplasmRespiration is not breathing