Hormones...?

Question

Which hormone would be affected if blood flow from the posterior pituitary was reduced and that change would lead to urine production being increased?

Answer 1

Antidiuretic hormone, also known commonly as arginine vasopressin, is a nine amino acid peptide secreted from the posterior pituitary. Within hypothalamic neurons, the hormone is packaged in secretory vesicles with a carrier protein called neurophysin, and both are released upon hormone secretion.

The single most important effect of antidiuretic hormone is to conserve body water by reducing the loss of water in urine. A diuretic is an agent that increases the rate of urine formation. Injection of small amounts of antidiuretic hormone into a person or animal results in antidiuresis or decreased formation of urine, and the hormone was named for this effect.

Answer 2

Posterior pituitary releases two hormones: oxytocin and vasopressin. The latter is also called antidiuretic hormone(ADH). Diruresis means passing of urine. ADH lowers urine output. When this hormone is not released or released in reduced amount because of reduced blood flow from the posterior pituitary, the urine output would increase. This is because ADH would be in less amount in the blood. The targert organ of ADH is kidney, where it goes to the nephrons and finally to the loop of Henley and other parts of the nephron concerned with reasbsorption of water.As there will be less reasborption of water from the filtrate, much water will pass down the to the collecting tubules and the urine volume will increase.