Question 9 (0.75 points) A "salty medulla" refers to what? the storage of urine within the bladder the speed of electrochemical transmission withir nerve cells the location of insulin production within the pancreas C the location of reabsorption within the nephron

The correct answer is **D. the location of reabsorption within the nephron**.<br /><br />The "salty medulla" refers to the high concentration of sodium and chloride ions in the interstitial fluid of the renal medulla (the inner part of the kidney). This high salt concentration is crucial for the kidney's ability to concentrate urine and conserve water. The loop of Henle, a part of the nephron, dips into the medulla. The salty medulla creates an osmotic gradient that drives water reabsorption from the collecting ducts back into the bloodstream.<br />