Question

18. The distal convoluted tubule and collecting duct are responsive to ADH. Does increasing ADH make these tubes more or less permeable to water? 19. Urea diffuses out of the collecting tubule—where does it go? 20. Hydrogen ions (acid) are secreted into the filtrate at the distal convoluted tubule and the collecting tubule. 21. What is the function of the Vasa Recta? 22. The counter current multiplier system maintains the concentration of the medullary interstitial fluid. What other factors contribute to the medullary high solute concentration? 23. What is obligatory reabsorption? 24. What is the effect on the kidney of sympathetic stimulation? 25. What is inulin (not insulin!) used for? 26. What moves urine thru the kidneys? The trigon expands very little in the bladder. What type of epithelium is the bladder composed of?

Answer 1

18. The distal convoluted tubule and collecting duct are responsive to ADH. Does increasing ADH make these tubes more or less permeable to water?

ADH is known as an antidiuretic hormone. It reabsorbs water from the filtrate. It makes it more permeable to water.

19. Urea diffuses out of the collecting tubule—where does it go?

Urea diffuses out of the collecting ducts and it enters the ascending limb of the loop of Henle.

20. Hydrogen ions (acid) are secreted into the filtrate at the distal convoluted tubule and the collecting tubule.

Hydrogen ions are secreted in the proximal convoluted tubule and distal convoluted tubule.

21. Vasa recta is used for concentrating the urine. It reabsorbs water from the filtrate.