Figure 1 shows a single-celled pond organism (Amoeba proteus).
Figure 1
Which row of the table allows the net diffusion of oxygen into Amoeba proteus?
(1)
concentration of oxygen in water in ppm |
concentration of oxygen in Amoeba proteus in ppm |
|||
☐ | A | 4 | 4 | |
☐ | B | 10 | 10 | |
☐ | C | 4 | 10 | |
☐ | D | 10 | 4 |
(ii)
Amoeba proteus uses oxygen for aerobic respiration.
Complete the equation for aerobic respiration.
(1)
glucose + oxygen → .............................. + ............................. (+ energy is released)
Humans breathe faster when they exercise.
(i)
Which two changes allow the rate of respiration in the muscle to increase?
(1)
heart rate | amount of glucose delivered to the muscles |
|||
☐ | A | increases | increases | |
☐ | B | increases | decreases | |
☐ | C | decreases | increases | |
☐ | D | decreases | decreases |
activity | mean number of breaths per minute |
mean volume of air in one breath in dm3 | mean volume of air breathed in dm3 per minute |
at rest | 5.0 | 0.8 | 4.0 |
running at 5 metres per second | 24.7 | 2.7 | ? |
Figure 2
Calculate the mean volume of air breathed per minute when running at 5 metres per second.
Give your answer to one decimal place.
(2)
Devise an investigation to compare the mean number of breaths per minute for men, with the mean number of breaths per minute for women, when running at 5 metres per second on a running machine.
(4)
Whilst running, the leg muscles of an athlete tightened up, causing cramp.
Name the product of anaerobic respiration that can cause cramp.
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