Blood vessels
- Created by: Lottie Hodson
- Created on: 24-04-13 00:35
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- Blood Vessels
- ARTERY
- Function
- Carry blood away from the heart at high pressure
- Adaptations
- Thick wall (due to high pressure)
- Thick inner layer of muscle and elastic fibres
- Narrow lumen (increase pressure)
- Function
- VEIN
- Function
- Return blood to heart at low pressure
- Adaptations
- Thin wall (due to low pressure)
- Thin inner layer of muscle and elastic fibres
- Wide lumen
- Valves prevent back flow
- Function
- CAPILLARY
- Function
- Allow exchange of materials between blood and tissues
- Adaptations
- Very thin wall (single layer of cells)
- Narrow lumen (same diameter as red blood cell)
- White blood cell can squeeze through the walls
- Function
- ARTERY
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