A-Level Biology OCR A
Blood Low Pressure Heart Resistance Explain Structure Veins
Front |
Explain how the structure of veins makes them adapted for their function. |
Back |
Veins:- Function: carry low pressure deoxygenated blood (except pulm vein) to the heart
- Thin walls - no need for resistance to pulse because surges from heart are lost as blood passes thru capillaries
- Large lumen to allow more blood to flow with less vessel resistance because it is at low speed & pressure
- Valves to prevent backflow because blood is low pressure
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A-Level Biology OCR A