What causes cell walls to relax?\nOptions:\n- (A) exercise\n- (B) sweating\n- (C) adding heat\n- (D) Energy\n- (E) dilation\n- (F) heat or cold\n- (G) heat\n- (H) Dehydration OK. Let's think hard:
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Dilation occurs when cell walls relax. When oxygen level decreases, dilatation of the blood vessels occurs. Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.
So, the final answer is (E).
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