We have a lot of orifices and how does our body block off the water pressure from consuming us?
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Unlike an empty jar without a lid we are filled with stuff and are not actually empty in the way we would need to be to “full” with water.
Even an empty container would need to allow the trapped air to escape in order to fill with water.
So looking at each one of the openings we have.
Ears are blind tubes, they fill with water but empty quickly.
The mouth has air in it and we can get water in easily but we have a natural reflex to close the mouth so you might get a mouthful but not much more.
When we close our mouth we deal off the lungs and stomach from filling.
The anus is tight enough to prevent fluid leaking when you have diarrhea so not water gets in there.
Your urethra, the hole you pee out of is an open narrow tube, with a muscle to close it. It doesn’t leak so it is water tight.
The vaginal opening is a blind tube with air inside and might get a little water in it when you are inverted but not owning one, I can say for sure but it is not like an open jar and narrow so if it does, it would be probably unnoticed.
The human body is actually shaped like a complex donut from your mouth to your anus you are open all the way through but that path is filled with food and has valves that control the flow in and out at a number of points.
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