【英语时差8，16】恐惧的解析

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Y: One nice day you're walking along a wooded path. You come around a corner and there, coiled in the path, is a huge rattlesnake, it's rattles² abuzz. You are deathly afraid of snakes.

D: Various parts of the brain signal the nervous systems and organs to prepare to take action. The pupils of the eyes dilate³, the thyroid gland⁴ raises the resting metabolic⁵ rate, the bronchioles in the lungs dilate to admit more oxygen, hairs stand on end, heart rate and blood pressure rise to supply the body and brain with fuel.

Y: The liver begins to break down sugars for quick energy, blood vessels⁶ in the skin contract causing chills and sweating, the spleen pumps out white blood cells in case there is an injury, stomach and intestine⁷ enzyme⁸ secretion⁹ and muscle activity needed for digestion¹⁰ stop, and blood vessels in the stomach and intestines¹¹ contract to divert blood to the muscles.

D: The bladder and colon¹² prepare to empty, the central portion of the adrenal medulla floods the bloodstream with adrenaline and noradrenaline, constricting¹³ the blood vessels, breathing quickens. The entire body is in a state of high alert, ready to stay and fight or say "Feet don't fail me now."Y: Did you follow all that? Of course not, but all that, and more, happens in your body within seconds of your sensing a threat.

D: It makes us tired just thinking about it

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