RespirationEdexcel GCSE Biology: Flashcards

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Type of reaction is respiration?

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Type of reaction is respiration?: Exothermic — releases energy.
Why respire continuously?: To release energy for metabolic processes.
Word equation for aerobic respiration?: Glucose + oxygen → carbon dioxide + water.
Where does most aerobic respiration occur?: Mitochondria.
Word equation for anaerobic respiration in muscle?: Glucose → lactic acid.
Word equation for anaerobic respiration in yeast/plants?: Glucose → ethanol + carbon dioxide.
Which releases more energy per glucose, aerobic or anaerobic?: Aerobic — full glucose breakdown.
What is oxygen debt?: Extra oxygen needed post-exercise to break down lactic acid.
What causes muscle fatigue during exercise?: Build-up of lactic acid.
Independent variable in the respiration practical?: Temperature.
Why use a control (glass beads/soda lime)?: Ensures gas volume change is due to respiration, not another factor.
How is rate of respiration calculated?: Volume of gas ÷ time taken.
Does anaerobic respiration need oxygen?: No.
What does soda lime absorb?: Carbon dioxide.