- involves reactions catalysed by enzymes
- releases the energy the cells need to do everything
- process of releasing energy from the breakdown of glucose which goes on in every cell
- releases energy to..
- build large molecules from small ones-proteins from amino acids
- allow muscle to contract (animals)
- keep body temperature steady (mammals)
- turn sugars, nitrates and other nutrients into amino acids for making protiens (plants)
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· 'in the presence of oxygen'
· efficient way to release energy from glucose
· goes on all the time
· happens inside mitochondria
· Glucose -------> carbon dioxide + water (+ energy)
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- 'without oxygen'
- vigorous exercise- body cant get enough oxygen for aerobic respiration
- incomplete breakdown of glucose, produces lactic acid
- lactic acid causes pain in muscles & muscle fatigue
- not as much energy as aerobic
- oxygen debt- repay the oxygen that your muscles didn't get, break down the lactic acid
- keep breathing heavily after you stop exercising to pay back debt
- Glucose ----------> lactic acid (+ energy)
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- muscle cells use oxygen to release energy from glucose which is used to contract muscles
- physical activity...
- increases breathing rate- to meet demand for oxygen
- increases heart rate- to pump the blood quicker to get the oxygen to the muscle cells
- some glucose- stored as glycogen
- each muscle cell has it own store
- during exercise-glycogen converted back to glucose to provide more energy
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