GCSE Biology Paper 1 (9-1 Exams)
Blood Veins Lower Walls Describe Structure Pressured Thick
Front |
Describe the structure of veins |
Back |
- The blood is lower pressured so walls don't need to be as thick as artery walls
- Veins have a bigger lumen than arteries to help the blood flow despite the lower pressure
- Have valves to help keep the blood flowing in the right direction
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GCSE Biology Paper 1 (9-1 Exams)