| Date | May 2013 | Marks available | 1 | Reference code | 13M.3.SL.TZ1.5 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 5 | Adapted from | N/A |
Question
State the role of ligaments in human movement.
Explain the changes in ventilation rate during exercise.
Markscheme
connect bones to bones / enable joint movement/flexibility/articulation/ prevent dislocation
a. increased (muscle) cell respiration releases more CO2/decreases pH (in blood);
b. detected by (respiration centre in) brain/medulla;
c. signal sent to respiratory muscles to contract at a faster rate;
d. more oxygen carried by the blood / needed for aerobic (cell) respiration;
Examiners report
A relatively small number of candidates answered this option, but those who did generally achieved well.
Most candidates could state the role of ligaments.
A relatively small number of candidates answered this option, but those who did generally achieved well.
B2 (c) was well answered but B2 (d) was not, with students failing to explain the changes in ventilation during exercise.
