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Module 3: Exchange and transport
Quick questions on The mammalian heart and cardiac cycle: systole, diastole, valves and ECGs - OCR A-Level Biology A
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the structure of the heart?Show answer
The heart is a double pump made of cardiac muscle. The right side receives deoxygenated blood from the body in the right atrium and pumps it from the right ventricle to the lungs; the left side receives oxygenated blood from the lungs in the left atrium and pumps it from the left ventricle to the body. The left ventricle wall is much thicker because it must generate enough pressure to drive blood around the whole body, whereas the right ventricle only pumps to the nearby lungs at lower pressure.
What is the cardiac cycle?Show answer
The cardiac cycle is one complete heartbeat, conventionally split into three stages and driven entirely by pressure differences:
What is myogenic control of heart rate?Show answer
Cardiac muscle is myogenic, so the rhythm is set inside the heart:
What is q1?Show answer
State why the wall of the left ventricle is thicker than the wall of the right ventricle. [2 marks]
What is q2?Show answer
Explain the purpose of the delay imposed by the atrioventricular node. [2 marks]
What is q3?Show answer
Name the part of the ECG that represents ventricular depolarisation. [1 mark]
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