Question 18M.3.HL.TZ2.22
| Date | May 2018 | Marks available | [Maximum mark: 7] | Reference code | 18M.3.HL.TZ2.22 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline, Suggest | Question number | 22 | Adapted from | N/A |
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.
[2]
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.
Suggest reasons for the change in maximum heart rate with increasing age.
[2]
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.
Outline the use of defibrillation to treat life-threatening cardiac conditions.
[3]
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»