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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 Outline 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.

[2]
a.

Suggest reasons for the change in maximum heart rate with increasing age.

[2]
b.

Outline the use of defibrillation to treat life-threatening cardiac conditions.

[3]
c.

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.

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

b.

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»

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Option D: Human physiology » Option D: Human physiology (Core topics) » D.4 The heart
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Option D: Human physiology » Option D: Human physiology (Core topics)
Option D: Human physiology

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