The cells lose part of their liquids due to osmosis.
No. No more than swimming in the ocean will.
no, u will probably drown 1st if u get tired whilst swimming in the ocean, then all the other fishes will feed off your decaying dead body.
When they die, your body absorbs it.
Surfer's body are quite lean similar to a swimmer's body, since they are out in the water for the majority of the day and get toned by swimming in the ocean.
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Eventually it is consumed by cells. Stored in fat cells. Or leaves the body through sweat.
The immune system will target the body's own cells
The blood goes to all of the body parts.
it give up oxygen to the cell.
You can die because, you carnt breathe.
it happens in all cells in the body when they are deprived of oxygen.
All of your cells come from stem cells, so yes, you can grow more tissue from an organ from them. In fact this is what happens when your body tries to repair damage.