This exam focus covers Exam Focus within Blood Components and Vessels for GCSE Biology. Blood composition, red and white blood cells, platelets, plasma, blood vessel structure and function, adaptations for transport It is section 13 of 16 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 13 of 16
Practice
18 questions
Recall
24 flashcards
Exam Focus
Frequently ExaminedBlood components and function are core AQA content examined in almost every series. The most common question formats are:
- 2-mark describe questions: "Describe two adaptations of red blood cells for their function." Always state the adaptation AND explain how it helps (e.g., biconcave shape increases surface area, so oxygen diffuses in and out faster).
- 4-mark comparison tables: Artery, vein, and capillary structure and function comparisons are a reliable exam staple. Learn the table on this page.
- 6-mark extended response: "Explain how a red blood cell is adapted to carry oxygen efficiently." For full marks you must cover at least three adaptations, each with a clear structure-to-function explanation.
- Application questions: Contexts involving anaemia, blood clotting disorders, or exercise are used to test whether you can apply your knowledge (e.g., "A patient has haemophilia. Explain why a small cut could be dangerous.").
Key command words: "Describe" (state the feature), "Explain" (state feature + why it helps), "Compare" (similarities AND differences). Never just list — always link structure to function.