Which of the Following Statements Concerning Regulation of Blood Flow

question 129

Multiple Choice

Which of the following statements concerning regulation of blood flow is TRUE?

• A) In the systemic circuit, increased levels of metabolic waste products and decreased oxygen concentration in tissues promote hyperemia through the tissues.
• B) If blood flow to a tissue is blocked for a period of time and then the block is removed, the result is a reactive hyperemia in which blood flow through the affected tissue remains low.
• C) According to flow autoregulation, if blood pressure to an arteriole is decreased, blood flow will not return toward its original level until the original blood pressure is restored.
• D) In the systemic circuit, high levels of CO₂ and metabolites tend to cause contraction in the smooth muscle of arteriole walls.
• E) The resistance to blood flow in brain and heart vascular beds does not vary in response to changes in local gas or metabolite concentrations.

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