While lecturing to a group of physiology students, the instructor asks, What metabolic factors cause ...

Ans: B
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At least three metabolic factors affect cerebral blood flow: carbon dioxide, hydrogen ion, and oxygen concentration. Increased carbon dioxide provides a potent stimulus for vasodilationa doubling of the PCO2 in the blood results in a doubling of cerebral blood flow. Increased hydrogen ion concentrations also increase cerebral blood flow, serving to wash away the neurally depressive acidic materials. Decreased oxygen concentration also increases cerebral blood flow. Low sodium is a hypoosmolar intravascular environment that will pull sodium out of the cellsa response unrelated to blood cell volume or flow.

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