Question 18M.3.SL.TZ2.3
| Date | May 2018 | Marks available | [Maximum mark: 6] | Reference code | 18M.3.SL.TZ2.3 |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Describe, Determine, Identify, Predict | Question number | 3 | Adapted from | N/A |
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. 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»
Describe how the mean tidal volume after exercise could be determined using the graph.
[2]
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
Predict, with a reason, the effect of exercise on the rate of cell respiration.
[1]
increased due to increased demand for ATP/energy «from muscle activity»
Identify a muscle responsible for increasing the volume of the chest cavity.
[1]
diaphragm
OR
external intercostal muscles