Date | May 2018 | Marks available | 2 | Reference code | 18M.3.HL.TZ2.22 |
Level | Higher level | Paper | Paper 3 | Time zone | Time zone 2 |
Command term | Suggest | Question number | 22 | Adapted from | N/A |
Question
The graph shows the relationship between the maximum heart rate during exercise and a person’s age.
Outline one method that the researchers could have used to measure heart rate in this study.
Suggest reasons for the change in maximum heart rate with increasing age.
Outline the use of defibrillation to treat life-threatening cardiac conditions.
Markscheme
a. state the method/equipment
eg take the pulse.
b. how method/equipment works
eg count beats per minute.
c. during exercise on treadmill/bicycle
OWTTE.
a. muscles become less elastic
OR
less muscle tone
b. cells/mitochondria less efficient
c. more fat deposits
OR
blood/oxygen supply to heart tissue reduced
Accept other valid documented answers.
a. defibrillator is electrodes/a metal paddle/pad that is placed on the patient’s chest
b. the device determines whether fibrillation is happening
c. a series of electrical shocks are delivered through the electrodes
d. electrical impulse is used to depolarize the heart muscle
e. to re-establish the function of the SA node/natural pacemaker/natural rhythm «of the heart»