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Date May 2017 Marks available 3 Reference code 17M.3.SL.TZ1.3
Level Standard level Paper Paper 3 Time zone Time zone 1
Command term Explain Question number 3 Adapted from N/A

Question

A spirometer was used to measure the ventilation rate of a person at rest and pedaling at 22 km per hour on an exercise bike.

Calculate the difference in ventilation rate between resting and exercising.

[1]
a.

Explain the change in the tidal volume during exercise.

[3]
b.

Markscheme

25 − 22 = 3 breaths in 2 min = 1.5 breaths per min/0.025 breaths per sec

Units required.

a.

a. exercise increases / results in higher rate of respiration 

b. exercise produces more carbon dioxide / consumes more oxygen 

c. increased tidal volume excretes more carbon dioxide / obtains more oxygen 

d. increased tidal volume increases gas exchange «across alveoli» 

e. concentration gradient«s» of gases is maintained

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Core » Topic 6: Human physiology » 6.4 Gas exchange
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Core » Topic 6: Human physiology
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