when we are underwater, how does water not get inside our bodies through our eyes, ears, nose and every other orifice?
In: 504
Trying to ELI5…
One side:
We are water tight, since we spend the first 9-10 months of our lives in a fluid.
We have built in systems that prevent water to go where it not supposed to.
– Eyes, the ball itself is close, the socket is a closed space
– Ear, it is closed, the eardrum is a physical barrier, if it bursts the inner ear is a closed system the only way the water could go is your throat to the “pressure equlaizer tube” – i don’t know the proper name
– mouth, your lung is closed to solids and liquids by reflex in your throat… But even your lungs are a closed space (as for the stomach, more of that later)
– “rear end” xD, there are 2 sphincter muscles, one is voluntarily controlled the other is not. it is closed most of the time.
Other side:
It may be hard for you to believe, but from your mout to your rear end, those spaces are actually outside of your body. Phsically on the inner side, but inside your body
Humans are a tube, the outside is the skin, the inside is the digestive tract (plus lung) the human itself is the tube wall itself.
There is nothing directly goes inside you, when you eat or drink, it is broken down to base elements/nutrients and they are diffused trough the stomach wall and the small intestines.
In fact, if your stomach or colon ruptures that could lead a serious infection or death because of the gut bacteria there. They are beneficial, they help you break down food for a small percentage take and you are actually needing them. But if they are not in your gut, that evolved to host them, they would kill you
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