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When macula densa cells experience increased Na+ concentration in the filtrate, they respond by


A) increasing afferent arteriole constriction.
B) decreasing urine production.
C) decreasing renin secretion.
D) increasing aldosterone secretion.
E) increasing renin secretion

F) C) and D)
G) A) and E)

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A substance used to calculate plasma clearance must


A) pass freely through the filtration membrane of the renal corpuscle.
B) be readily reabsorbed.
C) be either a protein or a polysaccharide.
D) be secreted into the nephron.
E) be produced in the kidney.

F) B) and E)
G) None of the above

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Blood loss that occurs during surgery will stimulate cells in the


A) efferent arteriole.
B) wall of the right atrium.
C) proprioceptors.
D) juxtaglomerular apparatus.
E) None of the choices are correct.

F) B) and C)
G) All of the above

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Where do the ureters enter the urinary bladder?


A) The anterosuperior surface
B) The anteroinferior surface
C) The posteromedial surface
D) The posterolateral surface

E) B) and D)
F) A) and D)

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Water reabsorption by the renal tubules uses ________.


A) active transport
B) cotransport
C) solvent drag
D) osmosis
E) None of the choices are correct.

F) A) and D)
G) B) and C)

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Effects of aging on the kidneys include all of the following, except


A) an increased ability to eliminate uric acid and creatine from the blood.
B) a gradual decrease in the size of the kidneys.
C) a gradual decrease in blood flow through the kidneys.
D) a loss of general function.
E) a decline in absorption and secretion.

F) A) and E)
G) A) and D)

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Urea and mannitol are examples of which of the following types of diuretics?


A) Osmotic diuretics
B) Thiazide diuretics
C) Potassium-sparing diuretics
D) Carbonic anhydrase inhibitors
E) ADH inhibitors

F) A) and B)
G) A) and C)

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What is tubular reabsorption?


A) The process where the nephron returns water and some filtered molecules to the blood.
B) The reabsorption of blood cells in the nephron into the body.
C) The passage of water and ions into the filtrate during filtration in the nephron.
D) The absorption of proteins into the filtrate which later becomes urine.
E) The transport additional solutes from the blood into the filtrate by tubule cells.

F) B) and E)
G) C) and D)

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Which of the following events would increase filtration pressure?


A) Increase in capsular pressure
B) Constriction of the efferent arteriole
C) Increase in colloid osmotic pressure
D) Decrease in renal blood flow
E) Dilation of the efferent arteriole

F) B) and C)
G) A) and C)

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At the rate of 125 ml of filtrate/minute, estimate the amount of filtrate formed in 24 hours.


A) 45 liters
B) 90 liters
C) 125 liters
D) 180 liters
E) 200 liters

F) B) and D)
G) B) and C)

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