Question
(a) Define the term respiration.
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(b) A rowing machine is a piece of apparatus that is used in many fitness centres.
Fig. 4.1 shows a man training on a rowing machine. The man in the photograph has his arms
extended during the rowing stroke as shown in Fig. 4.2.
Use Fig. 4.2 to describe how the hand is moved closer to the chest during the rowing stroke.
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(c) The man has an intense workout on the rowing machine.
Fig. 4.3 shows his oxygen uptake before and during the exercise.
(i) Explain why there is a steep increase in the man’s oxygen consumption at the start of the
exercise.
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(ii) It took 10 minutes after the man had stopped rowing for his oxygen consumption to
decrease to its resting value.
On Fig. 4.3 draw a line between 20 minutes and 35 minutes to show the change in
oxygen consumption after exercise has stopped. [2]
(iii) Explain why the man’s oxygen consumption did not return to the resting value
immediately after exercise.
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Answer/Explanation
Ans:
Question
Choose words from the list to complete the sentences about respiration.
Each word may be used once, more than once or not at all.
alcohol carbon dioxide glucose
glycerol lactic acid oxygen water
During exercise muscle cells can respire anaerobically and convert ………………………………………..
to ……………………………………….. .
When yeast cells respire anaerobically they produce ……………………………………….. and
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Answer/Explanation
Ans: