The Blood Vessels

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1. What are an arteries walls like?

  • They are fairly thin, but there is a larger lumen as the blood is pumped at a lower pressure so the wall doesn't have to be that thick.
  • They are thick, containing layers of muscle to make them strong, which is needed because the blood in them is pumped at very high pressures.
  • They are one cell thick, allowing for the exchange of substances to happen easily.
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2. What do arteries do?

  • They carry blood away from the heart
  • They carry blood to the heart
  • They are involved in the exchange of materials between tissues.

3. What are the features of veins?

  • hey have a huge lumen with a thin cell wall and valves to keep the blood flowing in the right direction.
  • They have a large lumen and moderately thick walls but the blood is pumped at a lower pressure so they don't need to be thick. They have valves to keep the blood flowing in the same direction.
  • They are large with tiny lumens. They have very very thick cell walls to allow for blood to be pumped at high pressures.

4. What do capillaries do?

  • They are involved in the exchange of materials with tissues.
  • These carry blood to the heart.
  • These carry blood away from the heart.

5. What are the features of capillaries?

  • They have a huge lumen with a thin cell wall and valves to keep the blood flowing in the right direction.
  • They are very tiny with a small lumen and have one cell thick permeable walls which increases the rate of diffusion by decreasing the distance over which it occurs.
  • They are large with tiny lumens. They have very very thick cell walls to allow for blood to be pumped at high pressures.

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