Q-I know that the urine flows from the kidney to the bladder and then out of the body. But what happens when there is something that blocks this flow? From some recent problems in the family, I bel… ...

It turns out that these drugs can shut off urine flow when taken together. I spent an agonizing night trying to void my bladder and later ended up in the ship’s infirmary with a catheter.

During the course of these earlier experiments, it was noted that the intraventricular introduction of posterior pituitary polypeptides was followed by a prompt increase of flow in urine.