This exam focus covers Exam Focus within The Heart and Circulation for GCSE Biology. Heart structure, cardiac cycle, blood vessels, double circulation, heart rate control, and cardiovascular health It is section 12 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 12 of 14
Practice
20 questions
Recall
25 flashcards
Exam Focus
Exam FavouriteHeart structure and blood flow is one of the most reliably tested topics across all AQA Biology Paper 1 past papers. Heart diagram questions and cardiac output calculations appear in almost every exam series.
How it is tested:
- Blood flow path: "Describe the route taken by a red blood cell from the vena cava to the aorta" — must include all four chambers, valves, and major vessels in the correct order.
- Cardiac output calculation: CO = HR x SV. Often set in a context such as exercise data or an ECG trace. Always show working and include units (ml/min or litres/min).
- Structure-function questions: "Explain why the left ventricle has a thicker wall than the right ventricle" — requires linking wall thickness to the distance blood must travel and pressure required.
- Coronary heart disease: Cause (atherosclerosis), symptoms (angina), consequences (heart attack), treatment (stents, bypass surgery, statins).
- Blood vessel comparison: Table questions asking you to compare arteries, veins, and capillaries by wall thickness, pressure, valves, and direction of flow.
6-mark questions commonly ask you to describe or explain the cardiac cycle — practise stating systole and diastole, when valves open and close, and what produces each heart sound.