Features of Blood Vessels
Shows features of blood vessels including function, sizes and components.
- Created by: Harriet Goodship
- Created on: 06-01-13 22:45
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- Blood Vessels
- Arteries
- Carry blood away from heart
- Small lumen
- Thick wall, contains collagen + fibrous protein to give strength
- Maintain high pressure
- Small lumen
- Maintain high pressure
- Wall has elastic tissue to allow stretching and recoil for heart pump, when heart relaxes, recoil...
- Maintain high pressure
- Maintain high pressure
- Wall has smooth muscle that can contract and constrict artery
- Constriction narrows artery
- Endothelium is folded and can unfold when the artery stretches
- Veins
- Carry blood to heart
- Large lumen
- Ease blood flow
- Wall has thin collagen, smooth muscle + elastic tissue
- Do not need stretch + recoil, and are not actively constricted to reduce blood flow
- Contains valves
- Helps blood flow back to heart and prevent flow in opposite direction
- Thin wall can be flattened by action of skeletal muscle
- Pressure is applied to the blood, forcing blood to move along in a direction dictated by valves
- Thin wall can be flattened by action of skeletal muscle
- Helps blood flow back to heart and prevent flow in opposite direction
- Capillaries
- Allow exchange of materials between blood and cells via tissue fluid
- Narrow lumen
- Red blood cells squeezed along capillaries, help them give up oxygen, reduce diffusion path to tissue
- Walls have single layer of flattened endothelial cells
- Reduce diffusion distance
- Arteries
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