"Kidneys"
^ this is incorrect. Urea is a byproduct of protein metabolism. In the GI, blood proteins are broken down into ammonia, it is then absorbed and the liver then converts it to Urea. It is then released into the blood stream where the Kidney's take it up and eliminate it. Urea is then eliminated by the kidney's, but not produced by it.
its synthesized during the metabolic activity of the body. and is purified form the body in kidnies.
^so basically, liver makes urea not the kidneys
urea
All cells make urea, it is a waste product. The urea is processed by the kidneys (reabsorbing most of the water) then transfered by the ureters to the urinary bladder.
carbon dioxide
The liver produces urea when it metabolises (breaks down) proteins. This is done in hepatocytes (liver cells). Amino acids are first broken down into ammonia, which is highly soluble and toxic in the blood plasma, so ammonia is joined with carbon dioxide to make urea, this is less soluble and less toxic but a build up of urea is toxic in the blood. Urea is then transported in the blood to be filtered out by the kidneys.
In addition to urea, the liver produces bilirubin as a result of the recycling of red blood cells. The bilirubin is excreted through bile.
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the Kidneys
liver.
urine, feces, carbon dioxide,hormones,tears,sweat,salt, urea,fat..
The Ectoderm
kidney