64. Why is a drop in blood pressure potentially dangerous?
(A) Active cells, like those in the brain, need a continuous supply of oxygen and nutrients.
(B) Once pressure drops, it can take hours to increase it again.
(C) Low blood pressure leads to gas bubbles in the blood that can cause a stroke or the “bends”.
(D) If pressure is not high enough, blood vessels collapse and can become stuck closed.

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