The Circulatory system (Blood vessels)
- Created by: blloob1
- Created on: 27-04-14 13:16
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- Circulatory system-Blood vessels
- Arteries
- Cary blood away from the heart
- The heart pumps blood out at highe pressure so the artery walls are strong and elastic
- The walls are tick compaired to the gole down the middle ( The Lumen)
- Tey contatin layers of muscle to make them strong
- They contain elastic fibres to allow them to spring back
- Tey contatin layers of muscle to make them strong
- The walls are tick compaired to the gole down the middle ( The Lumen)
- Capillaries
- Involved in the exchange of materials at the tissues
- Arteries branch in to capill\ries
- Capillaries are to small to see
- They carry the blood realy close to every cell ii the body to exchange substances with them
- They have permiable walls so substances can diffuse in and out
- They supply food andoxygen and take away waste like co2
- Their walls are usualy only one cell thick this increases the rate of diffusion by decreasing the distance over which it occurs
- Veins
- These carry blood to the heart
- capillaries eventualy join up to for veins
- blood is at a lower presure in the veins so the walls dont need to be as thicck as artery walls
- They have bigger lumen then arteries to help the blood flow despite lower presure
- They also have valves to keep the blood flowing in the right direction
- Arteries
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