1 markWhich of the following is a method that a doctor would suggest to a patient to reduce their risk of developing coronary heart disease?
Inserting a stent
Coronary heart bypass surgery
Angioplasty
Controlled exercise
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1 markWhich row of the table below shows the correct chambers of the heart, from those with the thinnest walls to those with the thickest?
|  | thinnest → thickest | ||
| A | left ventricle | right ventricle | left atrium |
| B | left atrium | left ventricle | right ventricle |
| C | right ventricle | left atrium | left ventricle |
| D | left atrium | right ventricle | left ventricle |
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1 markThe diagram below shows a vertical section through a human heart.
Which row of the following table has the correct names for the structures labelled in the diagram?
| Â | X | Y | Z |
| A | atrioventricular valve | semilunar valve | septum |
| B | semilunar valve | atrioventricular valve | septum |
| C | semilunar valve | semilunar valve | atrioventricular valve |
| D | atrioventricular valve | atrioventricular valve | septum |
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What is the sequence of contractions in one heartbeat?
left atrium and left ventricle together, pause, right atrium and right ventricle together
left atrium, left ventricle, right atrium, right ventricle, pause
right atrium and left atrium together, right ventricle and left ventricle together, pause
right atrium, right ventricle, left atrium, left ventricle, pause
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1 markFour different stages in one heartbeat are shown in the diagram below.
Which of the following depicts a correct order of stages?
W→ X → Y → Z
X → Z → W → Y
W → Y → Z → X
X → W → Y → Z
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The diagram shows a section through the human heart. 
What will be the state of the valves when the walls of chambers X and Y are contracting?
| Â | valves | |||
| Â | 1 | 2 | 3 | 4 |
| A | closed | open | open | closed |
| B | closed | open | closed | open |
| C | open | closed | open | closed |
| D | open | closed | closed | open |
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