23. In mammals, the medullary interstitial fluid near the renal pelvis isto the

Question

23. In mammals, the medullary interstitial fluid near the renal pelvis isto the urine entering the collecting duct a. hyperosmotic b. isosmotic c. hyposmotic d. isoionic and hyposmotic 24. In mammals ADH acts on the by a. collecting duct; removing aquaporin channels from the membrane. b. collecting duct; inserting aquaporin channels into the membrane. c. loop of Henle; removing aquaporin channels from the membrane d. loop of Henle; inserting aquaporin channels into the membrane. 25. A patient that has internal bleeding is experiencing hypovolemia (lowered blood volume). Which of the following would not occur in response. a. Juxtaglomerular cell release of renin b. Angiotensin Il promotion of thirst c. Aldosterone secretion to promote Na reabsorption d. All would occur

Explanation / Answer

23. a

in renal water reabsorption, the medullary interstitium plays a huge role in strengthening up a great hypertonicity. this pulls water out of the loop of Henle and the collecting duct system. This hypertonicity is produced by an efflux of urea of the internal medullary collecting duct.

24. a

When there is a shift in the blood plasma to the less concentrated manner the level of ADH reduces. now from collecting tubule cell membranes aquaporins are eliminated, and the passage of water out of urine and into the blood decreases.

25. d.

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