AQA Biology Respiration

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  • Created by: Lil5
  • Created on: 30-03-16 16:03
What is anaerobic respiration?
Not enough oxygen may reach the muscles during exercise. When this happens, they use anaerobic respiration to obtain energy.
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What does anaerobic respiration involve?
Anaerobic respiration involves the incomplete breakdown of glucose. It releases around 5% of the energy released by aerobic respiration, per molecule of glucose. The waste product is lactic acid rather than carbon dioxide and water: glucose → lactic
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What is Muscle fatigue?
Muscles become fatigued (tired) during long periods of vigorous activity. This means that they stop contracting efficiently. One cause of this is the build-up of lactic acid in the muscles from anaerobic respiration. The lactic acid is removed from t
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Explain oxygen debt.
Much less energy is released during anaerobic respiration than during aerobic respiration. This is because the breakdown of glucose is incomplete. Anaerobic respiration produces an oxygen debt. This is the amount of oxygen needed to oxidise lactic ac
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What is aerobic respiration?
Respiration is a series of reactions in which energy is released from glucose. Aerobic respiration is the form of respiration which uses oxygen. It can be summarised by this equation: glucose + oxygen → carbon dioxide + water (+ energy) Energy is sho
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Energy released during respiration is used by the organism in several ways. It may be used to build up larger molecules from smaller ones. Name an example:
Plants make amino acids from sugars, nitrates and other nutrients These amino acids are then built up into larger molecules - proteins Energy is used by animals to enable the muscles to contract so that the animals can move. Mammals and birds keep th
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During exercise, the muscle cells respire more than they do at rest. What does that mean?
Oxygen and glucose must be delivered to them more quickly Waste carbon dioxide must be removed more quickly
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How is this achieved?
by increasing the heart rate, rate of breathing and the depth of breathing.
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What does increasing the heart rate do the rest of the body?
It increase the blood flow around the body.
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What do the muscles store?
The muscles store glucose as glycogen. This can then be converted back to glucose for use during exercise.
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Card 2

Front

What does anaerobic respiration involve?

Back

Anaerobic respiration involves the incomplete breakdown of glucose. It releases around 5% of the energy released by aerobic respiration, per molecule of glucose. The waste product is lactic acid rather than carbon dioxide and water: glucose → lactic

Card 3

Front

What is Muscle fatigue?

Back

Preview of the front of card 3

Card 4

Front

Explain oxygen debt.

Back

Preview of the front of card 4

Card 5

Front

What is aerobic respiration?

Back

Preview of the front of card 5
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