Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 41, Problem 3VCQ

Figure 41.8 Loop diuretics are drugs sometimes used to treat hypertension. These drugs inhibit the

reabsorption of Na+ and Cl- ions by the ascending limb of the loop of Henle. A side effect is that they increase urination. Why do you think this is the case?

Chapter 41, Problem 3VCQ, Figure 41.8 Loop diuretics are drugs sometimes used to treat hypertension. These drugs inhibit the

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Is this following statement correct? In the kidney, vasoconstriction of the afferent arteriole increases glomerular filtration rate, because hydrostatic pressure in the glomerular capillaries increases (much like putting your thumb over the end of a garden hose increases the pressure and causes the water to exit the hose with greater velocity and travel a greater distance).
Acetazolamide is a diuretic that blocks the activity of the enzyme carbonic anhydrase inside kidney tubule cells. This blockage prevents theformation of carbonic acid from CO2 and water. Normally, carbonicacid dissociates to form H+ and HCO3−, and the H+ is exchanged forNa+ from the urine. Blocking the formation of H+ in the tubule cellsblocks Na+ reabsorption, thus inhibiting water reabsorption andproducing the diuretic effect. With this information in mind, what effectdoes acetazolamide have on blood pH, urine pH, and respiratory rate?
Drugs that increase urine flow (diuretic drugs) are often employed in the treatment of hypertension (high blood pressure) or other disease states. Three physiological categories of such drugs are ones that (i) function as loop diuretics, (ii) inhibit the action of aldosterone, and (iii) block Na+ channels in the collecting ducts. Explain why each of these categories would be expected to increase Na+ excretion and urine flow.

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