What is the function of the antidiuretic hormone?
The antidiuretic hormone (ADH), also known as vasopressin, is produced by the hypothalamus and released from the posterior pituitary gland. Its main function is to regulate the body's water balance by controlling the reabsorption of water in the kidneys.
ADH acts on the collecting ducts of the kidneys, increasing their permeability to water. This allows water to be reabsorbed back into the bloodstream, leading to a decrease in urine production and a more concentrated urine.
The primary role of ADH is to prevent excessive water loss from the body, helping to maintain proper hydration and preventing dehydration. It is released in response to various stimuli, including increased blood osmolality, low blood volume, and low blood pressure. ADH secretion is inhibited when adequate hydration is achieved.
Additionally, ADH also has vasoconstrictive properties, meaning it narrows the blood vessels, which can help increase blood pressure when necessary. This function is particularly important during times of low blood volume or hypovolemia to ensure adequate blood flow to vital organs.