When white blood cells and macrophages run into more foreign invaders than they can handle, they let loose pyrogen chemicals that tap the hypothalamus and raise your body’s thermostat, calling in a systemic fever to burn everything.當白血球細胞與巨噬細胞面臨超過負荷量的陌生敵人,他們釋出致熱化學物質刺激視床下部並提高體溫,使人全身發燙,以燒掉入侵者。