CourseCourseConceptConceptDocsDocuments

IB Biology HL B3.2.5 Vein Adaptations Questions

Explore how venous structure enables one-way return at low pressure through valve action, skeletal-muscle compression and large low-friction lumens 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 maintain one-way blood movement towards the heart.
  • Explain how thin, flexible vein walls can be compressed by surrounding skeletal muscles to assist low-pressure return.
  • Relate large venous lumens to reduced friction and efficient blood return at low pressure.

Learn this topic

Study B3.2.5—Vein adaptations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

All question bank results loaded