Brad suffers from anxiety attacks during which he hyperventilates and occasionally passes out. Why would he faint? A) Elevated blood P _CO2 causes vasodilation of cerebral arterioles, leading to enhanced blood supply to areas of the brain. B) Decreased blood P _CO2 causes vasoconstriction of cerebral arterioles, leading to reduced blood supply to areas of the brain. C) Increased P _O2 of blood causes vasoconstriction of cerebral arterioles, leading to reduced blood supply to areas of the brain. D) Decreased P _O2 of blood causes vasodilation of cerebral arterioles, leading to enhanced blood supply to areas of the brain.

Question

Quizplus · Accepted Answer

During hyperventilation, the rapid breathing leads to decreased carbon dioxide (CO2) levels in the blood. This decrease in CO2 causes vasoconstriction of cerebral arterioles, which in turn reduces blood supply to the brain, potentially leading to fainting.

Brad Suffers from Anxiety Attacks During Which He Hyperventilates and Occasionally