How to Revise Exchange and Transport — Pearson A-Level Biology
Describe the structure of the heart and blood vessels. Explain the cardiac cycle
Examiner Tips for Exchange and Transport
- Use diagrams to support your description.
- Memorise the flow of blood through the heart.
- Explain pressure changes during the cycle.
- Draw and label diagrams of xylem and phloem.
- Learn the cohesion-tension theory for transpiration.
- Use mnemonics to remember the direction of transport in xylem and phloem.
- Use diagrams to label structures.
- Practice explaining the sequence of events.
Common Mistakes in Exchange and Transport
- Confusing arteries and veins.
- Omitting the role of valves.
- Mixing up the order of the cardiac cycle.
- Confusing transpiration with translocation.
- Thinking that transpiration only occurs in leaves.
- Misunderstanding the role of stomata in gas exchange.
Key Marking Points
- Labels main structures of the heart and blood vessels.
- Describes the function of each part.
- Explains the cardiac cycle phases (systole and diastole).
- Links structure to function in circulation.
- Describe the structure of xylem and phloem tissues.
- Explain the process of transpiration and its driving forces.