IB Biology SL B3.2.5 Vein adaptations
IB Biology SL B3.2.5 Vein adaptations
Practise linking vein structure to low-pressure blood flow, valve action, muscle compression and evidence from diagrams or experiments.
How this is tested
- explain why thin, flexible vein walls allow nearby muscles to assist blood flow
- interpret vessel diagrams or micrographs to recognise vein features and function
- link valves with one-way flow towards the heart and reduced backflow