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Blood flow is largely regulated at a tissue level. Which of the following could be said regarding this process?

waelhammad
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2022-10-18
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Blood flow is largely regulated at a tissue level. Which of the following could be said regarding this process?

  1. A rise in the blood level of O2 will result in vasodilation
  2. A raised CO2 level results in vasodilation
  3. Acidaemia directly increases vasopressin (ADH) release
  4. A raised CO2 blood level will result in an increased serum alkalinity
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waelhammad
2022-10-18
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B: A high level of CO2 in the tissues will promote vasodilation to remove it, and to provide more O2. ADH produces vasoconstriction which is the opposite of what is required to correct acidaemia. Normally (in the absence of ventilation problems) the blood buffers prevent any change in blood pH so choice D is wrong.

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