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B4: Quiz 8 – Answers
B4: Quiz 8 – Answers
1)
a) Their breathing rate (number of breaths per minute) will increase. This is to increase the amount of oxygen that comes into the lungs and then into the bloodstream.
b) Their heart rate will increase to pump more blood around the body. This is to increase the amount of oxygen that is delivered to muscle cells.
2)
a) The build-up in lactic acid occurs because our body is unable to supply the muscle cells with enough oxygen for aerobic respiration. This means that the muscle cells start to undertake anaerobic respiration, which produces lactic acid, thus increasing the levels of lactic acid.
b) It can cause muscle fatigue, which is where the muscles get tired and stop contracting efficiently. Also, it can be painful and cause cramp
3) Oxygen debt is the amount of oxygen that is required to convert the lactic acid produced during anaerobic respiration into carbon dioxide and water
4) Aerobic respiration
5) Exercising causes the levels of lactic acid in the muscles and blood to increase; the exercise has led to oxygen debt. This lactic acid has to be oxidised to produce water and carbon dioxide. Oxygen is needed to oxidise the lactic acid and the muscle cells get the oxygen from the bloodstream. As there are high levels of lactic acid after exercising, the heart needs to continue to beat quite fast to supply the oxygen needed for the muscle cells to oxidise the lactic acid. This is why the heart rate does not go straight back to 58 bpm after the individual stops exercising.
6) The lactic acid gets taken to the liver via the bloodstream. The liver then converts the lactic acid back into glucose, which can be used for future respiration reactions
a) Their breathing rate (number of breaths per minute) will increase. This is to increase the amount of oxygen that comes into the lungs and then into the bloodstream.
b) Their heart rate will increase to pump more blood around the body. This is to increase the amount of oxygen that is delivered to muscle cells.
2)
a) The build-up in lactic acid occurs because our body is unable to supply the muscle cells with enough oxygen for aerobic respiration. This means that the muscle cells start to undertake anaerobic respiration, which produces lactic acid, thus increasing the levels of lactic acid.
b) It can cause muscle fatigue, which is where the muscles get tired and stop contracting efficiently. Also, it can be painful and cause cramp
3) Oxygen debt is the amount of oxygen that is required to convert the lactic acid produced during anaerobic respiration into carbon dioxide and water
4) Aerobic respiration
5) Exercising causes the levels of lactic acid in the muscles and blood to increase; the exercise has led to oxygen debt. This lactic acid has to be oxidised to produce water and carbon dioxide. Oxygen is needed to oxidise the lactic acid and the muscle cells get the oxygen from the bloodstream. As there are high levels of lactic acid after exercising, the heart needs to continue to beat quite fast to supply the oxygen needed for the muscle cells to oxidise the lactic acid. This is why the heart rate does not go straight back to 58 bpm after the individual stops exercising.
6) The lactic acid gets taken to the liver via the bloodstream. The liver then converts the lactic acid back into glucose, which can be used for future respiration reactions
Questions
1) An individual starts jogging at quite a fast pace.
a) What happens to the individual’s heart rate? Explain why this change happen.
b) What happens to the individual’s breathing rate? Explain why this change happen.
2) The level of lactic acid in an athlete increases as they start exercising.
a) Explain why exercising causes the levels of lactic acid in an athlete to increase.
b) How does the build up of lactic acid in muscles affect the performance of a muscle?
3) What is oxygen debt?
4) Out of aerobic respiration and anaerobic respiration, which produces more energy?
5) A student monitors their heart rate before, during and after doing some exercise. Their results are shown below.
1) An individual starts jogging at quite a fast pace.
a) What happens to the individual’s heart rate? Explain why this change happen.
b) What happens to the individual’s breathing rate? Explain why this change happen.
2) The level of lactic acid in an athlete increases as they start exercising.
a) Explain why exercising causes the levels of lactic acid in an athlete to increase.
b) How does the build up of lactic acid in muscles affect the performance of a muscle?
3) What is oxygen debt?
4) Out of aerobic respiration and anaerobic respiration, which produces more energy?
5) A student monitors their heart rate before, during and after doing some exercise. Their results are shown below.
The heart rate before the student started exercising was 58 bpm. The student’s heart rate does not come back to this level until 7 minutes after they stop exercising. Explain why the student’s heart rate does not come back to 58 bpm immediately after they stop exercising.
6) The liver can also deal with the lactic acid that is produced during anaerobic respiration. Explain how the lactic acid gets to the liver and explain what the liver does with the lactic acid.
6) The liver can also deal with the lactic acid that is produced during anaerobic respiration. Explain how the lactic acid gets to the liver and explain what the liver does with the lactic acid.