How come whenever we submerge ourselves underwater our entire body doesn’t fill with water?

Question

We have a lot of orifices and how does our body block off the water pressure from consuming us?

In: 1

Answer 1

All your orifices are closed except for your nose and the pressure of air inside of your lungs keeps the water from filling them. No other orifice opens your body cavity to external environment without a closure of some sorts.