Circulatory System - Blood Vessels
- Created by: GeorgiaHaworth
- Created on: 09-05-14 11:26
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- Blood Vessels
- ARTERIES
- The hearts pumps blood out at high pressure
- Artery walls are strong and elastic.
- They contain thick layers of muscle to make them strong, and elastic fibres to allow them to stitch and spring back.
- Artery walls are strong and elastic.
- The walls are thick compared to the size of the hole (lumen)
- They contain thick layers of muscle to make them strong, and elastic fibres to allow them to stitch and spring back.
- Carry blood away from the heart.
- The hearts pumps blood out at high pressure
- CAPILLARIES
- Arteries branch into capillaries.
- ARTERIES
- The hearts pumps blood out at high pressure
- Artery walls are strong and elastic.
- Artery walls are strong and elastic.
- The walls are thick compared to the size of the hole (lumen)
- Carry blood away from the heart.
- The hearts pumps blood out at high pressure
- ARTERIES
- Capillaries are really tiny (too small to see).
- They carry the blood really close to every cell in the body and exchange substances with them
- They have permeable walls, so substances can diffuse in and out.
- They supply food and oxygen, and take away waste such as CO2.
- Their walls are usually only one cell thick. This increases the rate of diffusion by decreasing the diffusion distance.
- Arteries branch into capillaries.
- Veins
- Capillaries eventually join up to form veins.
- CAPILLARIES
- Arteries branch into capillaries.
- Capillaries are really tiny (too small to see).
- They carry the blood really close to every cell in the body and exchange substances with them
- They have permeable walls, so substances can diffuse in and out.
- They supply food and oxygen, and take away waste such as CO2.
- Their walls are usually only one cell thick. This increases the rate of diffusion by decreasing the diffusion distance.
- Arteries branch into capillaries.
- CAPILLARIES
- The blood is at lower pressure in the veins so the walls don't need to be as thick as artery walls.
- They have a bigger hole (lumen) than arteries to help the blood flow despite the lower pressure.
- They also have valves to help keep the blood flowing in the right direction.
- Capillaries eventually join up to form veins.
- ARTERIES
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