The kidneys and the large intestine. The kidneys remove excess water from the bloodstream, but the large intestine removes water from food while digesting. :)
Drinking excess water sometimes causes hyponatremia, because the absorption of water into the bloodstream can dilute the sodium in the blood.
the large intestine
When you consume water, it stays almost entirely in the digestive tract until it reaches the large intestines where the remainder (most of the water initially consumed) is absorbed. The water is then sent to the kidneys, from there put into the bloodstream, and from there cells can absorb the water. Any excess water goes from the kidney to the bladder, and the rest is history.
If excess water moves into an animal cell, it will eventually burst. This happens if the cell is placed in a hypotonic solution (a solution with a lower solute concentration than the cell).
You're kiddin', eh?
As the material moves through the large intestine, water is absorbed into the bloodstream. The remaining material is readied for elimination from the body.
The kidneys filter unwanted waste, minerals, excess water from the blood.
As the material moves through the large intestine, water and nutrients are absorbed into bloodstream. The remaining material is readied for evacuation from the body.
The large intestine absorbs excess water from the undigested matter that will then become feces.See the Related Link below.
The small intestine absorbs the nutrients in food, but the large intestines absorb excess water.
Yes. They can drink salt water because their supraorbital gland filters excess salt from the bloodstream. However they will drink fresh water as well when on land.
This process is called transpiration. It is essentially how water moves from the roots to the leaves and back into the atmosphere.
Some protazoans have a contractile vacuole which is an organ that pumps water out of cells. Other cells don't have these and instead water moves out by osmosis.
The water goes to the tissue not the bloodstream.
"They can drink salt water because their supraorbital gland filters excess salt from the bloodstream. The salt is excreted in a concentrated fluid from the nasal passages." http://en.wikipedia.org/wiki/Supraorbital_gland
In the large intestine,water and mineral salts are absorbed into the bloodstream.
Excess water drinking will "pull" sodium from your cells, in an attempt to minimize or avoid hyponatremia. However, too much water drinking can "wash out" sodium from the bloodstream, and precipitate dangerous problems, such as seizures, coma, and even death.
The antidiruretic hormone signals to the kidneys to reabsorb water back into the bloodstream.