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.
Describe how the mean tidal volume after exercise could be determined using the graph.
Predict, with a reason, the effect of exercise on the rate of cell respiration.
Identify a muscle responsible for increasing the volume of the chest cavity.
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. measure a volume difference for an individual breath
OR
maximum − minimum for an individual breath
b. repeat for several breaths and determine a mean
increased due to increased demand for ATP/energy «from muscle activity»
diaphragm
OR
external intercostal muscles