Osmoregulation determines how much water is reabsorbed into the blood at nephrons. The amount of water reabsorbed is controlled by ADH (anti-diuretic hormone). ADH makes the nephrons more/less permeable to allow more/less water to be reabsorbed back into the blood. This occurs like this...
- The brain is constantly monitoring the level of water in the blood
- The brain instructs the pituitary gland to release ADH into the blood (according to how much water needs to be reabsorbed)
NOTE: the process of osmoregulation is controlled by a mechanism called 'negative feedback'. This basically means if the water gets too high/low a mechanism will be triggered that brings the level down/up (back to normal)
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