How come you wake up at night to urinate but not to do anything else?
为什么半夜醒来只想小便?
Because the sophisticated, intelligent neurons in your gut that control colon contractions, which push out waste, are also influenced by your body’s circadian rhythm, the internal clock that wakes you when it’s light out and makes you feel sleepy at night. So most people don’t have the urge to empty their colon in the middle of the night. On the other hand, the bladder, which acts a reservoir for the continuous flow of urine produced in the kidneys, can stretch only up to a certain volume before you gotta go. Normally, you can sleep six to eight hours without having to urinate, but certain medical conditions or drinking too much water before bed can wake you to use the bathroom at night.
这是因为控制着结肠收缩的复杂敏感神经元,也会受到人体生理周期(也就是排便规律)的影响,白天生物钟会让你醒来,晚上会让你睡觉。到了半夜,大部分人并不会急着去排便。另一方面,膀胱一直都储存着肾脏排泄出的不间断的尿液流,到了一定的容量,你就需要上厕所了。一般说来睡眠六到八小时是无需小便的,但某种病症或是睡前多喝水则会使你起夜了。
Why do we have fingerprints?
我们为什么有指纹?
Many experts think it’s to improve grip, but a British study from a few years back suggests otherwise. Researchers found that a fingerprint’s ridges actually made it harder to hold flat, smooth surfaces, like Plexiglas, because they reduced the skin’s contact area. Instead, they think our prints might help wick water off our fingertips or allow our skin to stretch more easily, which can protect it from damage and help prevent blisters. Other scientists have suggested fingerprints could improve our sense of touch. What we do know for sure is that no two people’s fingerprints are the same, even among identical twins.
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2020-09-15
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