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Date May 2018 Marks available 1 Reference code 18M.3.SL.TZ2.3
Level Standard level Paper Paper 3 Time zone Time zone 2
Command term Identify Question number 3 Adapted from N/A

Question

In an experiment to explore the effect of exercise on ventilation rate, a subject breathed into a data logging sensor that measured air flow.

The graphs show the result before the subject exercised and immediately after the exercise had finished.

Determine the ventilation rate after exercise.

 

[2]
a.

Describe how the mean tidal volume after exercise could be determined using the graph.

[2]
b.

Predict, with a reason, the effect of exercise on the rate of cell respiration.

[1]
c.

Identify a muscle responsible for increasing the volume of the chest cavity.

 

[1]
d.

Markscheme

a. four breaths in 10 s = 4 × 6 «breaths min–1»
OR
six breaths in 15 s = 6 × 4 «breaths min–1» 

b. 24 «breaths min–1» 

a.

a. measure a volume difference for an individual breath
OR
maximum − minimum for an individual breath 

b. repeat for several breaths and determine a mean 

b.

increased due to increased demand for ATP/energy «from muscle activity»

c.

diaphragm
OR
external intercostal muscles

d.

Examiners report

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

Syllabus sections

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