IB Biology HL 3.2.5 Vein Adaptations Question Bank
Practise IB Biology HL 3.2.5 by explaining why veins use thin walls, valves and surrounding muscle to return blood at low pressure.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how thin vein walls permit compression while valves prevent backflow.
- Use pressure and muscle-action evidence to explain one-way venous return.
B3.2.5—Vein adaptations question 1
[Maximum number: 1]
What is a reason that veins have relatively thin walls compared to arteries?
A
Allows muscle contraction to assist in blood flow
B
Prevents a blood clot forming
C
Allows exchange of materials with tissue fluid
D
Easier attachment of semilunar valves
A
All question bank results loaded