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Question
How is the amount of urine produced regulated?
Solution 1
The amount of urine produced depends on the amount of excess water and dissolved wastes present in the body. Other factors, such as an organism's habitat and hormones such as Anti-diuretic hormone (ADH), also regulate the amount of urine produced.
Solution 2
- The amount of urine produced is controlled by a hormone released from the posterior lobe of the pituitary gland, called antidiuretic hormone (ADH) or vasopressin. This hormone's role is to promote the reabsorption of water from the nephric filtrate.
- When there is sufficient water in the blood, less ADH is secreted, resulting in less water being reabsorbed from the nephric filtrate and, therefore, more urine is produced. Conversely, when there is less water in the blood, more ADH is released, leading to increased water reabsorption by the blood capillaries surrounding the nephron, which reduces the amount of urine produced.
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