IB Biology HL B3.2.5 Vein Adaptations Questions
Explore how venous valves prevent backflow and thin, flexible walls let muscle compression assist low-pressure return in IB Biology HL B3.2.5.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how venous valves prevent backflow and keep blood moving towards the heart.
- Relate thin, flexible vein walls to muscle compression that assists low-pressure blood return.
IB Biology HL B3.2.5 Vein Adaptations Questions 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
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