How is the amount of urine produced regulated?
The amount of urine produced depends on how much excess water there is in the body and how much of dissolved waste there is to be excreted. On a hot day, when we sweat and lose a lot of body water and salts, most of the water and salts in kidney will be reabsorbed into the blood from the filtrate in the tubule. Thus the volume of urine produced will be less. In winters, when we do not sweat a lot, a litde water and salts will be reabsorbed and the volume of urine produced will be more. Thus there is perfect osmoregulation in the body.
