Describe the trend for breathing rate shown in Figure 6 - AQA - GCSE Biology - Question 4 - 2020 - Paper 1
Question 4
Describe the trend for breathing rate shown in Figure 6.
Use data from Figure 6 in your answer.
The safe maximum heart rate for a person exercising can be calculat... show full transcript
Worked Solution & Example Answer:Describe the trend for breathing rate shown in Figure 6 - AQA - GCSE Biology - Question 4 - 2020 - Paper 1
Step 1
Describe the trend for breathing rate shown in Figure 6.
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Answer
The breathing rate initially increased, reaching a peak around 4 minutes where it stabilized at approximately 50 breaths per minute. After this point, the breathing rate remained constant.
Step 2
Calculate the safe maximum heart rate for the man.
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Answer
To calculate the safe maximum heart rate, we can use the formula:
extsafemaximumheartrate=220−extage
Assuming the man is 45 years old, the calculation would be:
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Answer
The man's maximum heart rate, as indicated in Figure 6, is 140 beats per minute.
Step 4
Give the reason for his conclusion.
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Answer
The man concluded he was exercising at a safe heart rate because his maximum heart rate of 140 beats per minute is below the calculated safe maximum heart rate of 175 beats per minute.
Step 5
Explain the ways the man's body has responded to the exercise.
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Answer
The man’s body responded to exercise in several ways:
Heart Rate Increase: The heart rate increased to supply more blood to muscles and lungs, enhancing oxygen delivery and glucose provision.
Breathing Rate Increase: The breathing rate intensified to supply more oxygen and remove carbon dioxide effectively from the blood.
Oxygen Delivery: Increased oxygen provided energy for sustained muscle contraction.
Anaerobic Respiration: In case of oxygen shortage, anaerobic respiration could occur, leading to a buildup of lactic acid, which might result in muscle fatigue or pain.
These physiological changes illustrate the body's effort to meet the heightened demands of physical activity.
