Risk of hypothermia 體溫過低的風險

平時阿媽沖完涼，通常會滿頭大汗。兩天前，我見她的樣子好爽，便碰一碰她的前臂。我道︰「點解會凍冰冰？」她說︰「我沖完溫水再沖下凍水？」我解釋給她︰「這樣做可能會導致體溫過低。」以前中學上運動堂，老師提醒我們，剛跑完步或者做完劇烈運動不要立刻貼近冷氣機乘涼，道理都是一樣。

Vasodilation of arteriole 血管舒張

Vasoconstriction of arteriole 血管收縮

Arterioles contain smooth muscle, which can either relax and cause the vessel radius to increase (vasodilation) or contract and decrease the vessel radius (vasoconstriction).

Widmaier, E.P., & Raff, H. (2008). Vander’s Human Physiology: The Mechanisms of Body Function. New York, NY: McGraw-Hill.

arteriole: any of the small terminal twigs of an artery that ends in capillaries

Dictionary used: https://www.merriam-webster.com