Blood vessels
- Created by: haya yazeji
- Created on: 03-11-19 14:25
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- Blood vessels
- arteries
- carry blood away from the heart
- so artery walls are very strong and elastic
- heart pumps out blood at high pressure
- walls are thick compared to the size of the lumen
- lumen is the inside of the artery
- have elastic fibres to allow them to stretch and spring back
- contain thick layers of muscle to make them strong
- carry blood away from the heart
- capillaries
- involved in the exchange of materials at the tissues
- arteries branch into capillaries
- they are tiny- too small to see
- carry blood really close to every cell in the body to exchange substances with them
- have permeable walls
- so substances can diffuse in and out
- supply food and oxygen
- and take away waste like carbon dioxide
- walls are only one cell thick
- increases the rate of diffusion
- decreases the distance over which it occurs
- increases the rate of diffusion
- veins
- carry blood to the heart
- capillaries join up to form veins
- carry low pressure blood
- thin artery walls
- bigger lumen to blood flow despite it being low pressure
- have valves to make sure blood flows in the right direction
- prevent backflow
- arteries
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