| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.SL.TZ1.3 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Calculate | 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.
