Q:

Which of the following does NOT influence the resistance to blood flow?

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Which of the following does NOT influence the resistance to blood flow?


  1. diameter of the arterioles
  2. temperature of the blood
  3. haematocrit
  4. radius of the veins

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D: Resistance to blood flow is of interest on the arterial side of the circulation. Radius of veins is much greater than radius of arteries. Temperature does affect blood flow for example in the situation of extremities with “frostbite”.

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