27 When the concentration of antidiuretic hormone ADH rises in the blood a the

27 when the concentration of antidiuretic hormone adh

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___ 27.When the concentration of antidiuretic hormone(ADH) rises in the blooda. the walls of the collecting ducts become less permeable to dissolved solutes and waterb. water channels appear along the collecting duct epithelial cells as vesicles containing proteins called aquaporins arise from the Golgi apparatus and fuse to the epithelial cell membranesc. the ultrafiltrate flowing through the collecting duct becomes more hypotonicd. a greater volume of dilute urine is excretede. None of these statements regarding ADH is correct.___ 28.Antidiuretic hormone (ADH)223
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B. True or False/Edit___ 29.Only 400 ml of urine per day (known as the obligatorywater loss) is required to excrete the metabolic wastes produced by the body.___ 30.Reabsorptionis the movement of filtered water and molecules from the nephron tubules, through the tubular epithelial cells and eventually into the blood.___ 31.The osmolality of the filtrate is essentially the same as that of plasma at 300 mOsm/L and is thus isosmoticwith the plasma.___ 32.In the proximaltubule, the Na+/K+pumps are located along both the apical and basal sides of the epithelial cell membranes.___ 33.Nearly two-thirds of salt and water in the original ultrafiltrate is reabsorbed from the proximal tubule and returned to the blood.___ 34.The total metabolic cost for reabsorption in the proximal tubule and the loop of Henle is veryhigh — about 6% of the total calories required by the average adult every day.___ 35.For water reabsorption (osmosis) to occur from the filtrate, the tissue fluid flowing outside the nephron between the interstitial cells of the renal medulla must be hypotonic.___ 36.Tubular fluid leaving the loop of Henle and entering the distal tubule in the kidney cortex is hypotonic (about 100 mOsm/L) whereas the tissue fluid in the medulla is made hypertonic.___ 37.Because proteins (colloids) are present in the blood but not in the medullary fluid, water flows from the medulla into the peritubular (vasa recta) capillaries, thus removing water from the renal medulla.___ 38.Normally, 99.2% of the 180 L of glomerular ultrafiltrate is reabsorbed in the nephrons so that only 1.5 L of urine is excreted per day.C. Label the Figure -- Urea and Sodium Flow in the Countercurrent Multiplier SystemFigure 17.18 in the text is a summary of some very complex solute and fluid movements into and outof the loop of Henle and collecting tubule portions of the kidney nephron. Starting with the cortexregion in the upper left corner of figure 17.1 below, fill in the proper term(s) or chemical symbol(s) in
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