Understand how the kidney carries out its roles of excretion and of osmoregulation
Kidneys carried out the excretion of molecules called urea, containing nitrogen which is toxic to the body and cannot be stored. The form of nitrogen circulating in our body and are potentially toxic can be found in the amino acids which are used to growth, however, excess amino acids must be removed. Both liver and kidneys carry out the function to remove urea.
First, the blood circulated to the liver and amino acids are broken down and converted into molecules called urea. This reenter the blood stream that's to be removed to the and circulate into both kidneys. The kidneys will filter the urea from the blood and will be added to water to form urine, which drains down the ureter to collect in the bladder. The urea has now been removed from the body and is collected in the bladder in the form of urine.
The filtered blood returned to the circulation and travels back to blood stream with the toxic urea removed.
Osmoregulation
Osmo - osmosis
Regulation - control
Osmoregulation - the control of osmosis
Hypertonic -
Hypotonic -
The tissue fluid which surround body cells must be isotonic with the cytoplasm of the cell (the amount of water going in and out of the cell are equal) so that cells remain the same size and shape and maintain their function. Blood circulating into the tissue may too concentrated and cause hypertonic tissue fluid or maybe too dilute causing a hypotonic tissue fluid. Hypertonic would remove too much water and cause the cell to shrink, and hypotonic would add too much water and cause the cell to swell.
We can keep the tissue fluid isotonic to the cell cytoplasm by controlling the composition of blood. Blood forms the tissue fluid. The role of kidney is to control the composition of blood. It removes excess water and salts and excrete them down the ureter.
By controlling the amount of water and salts in the blood and therefore keep the tissue fluid isotonic.
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