Question 1

Which of the following best describes the function of the filtration slits between podocyte foot processes in the glomerulus?

Accepted Answer

They allow water and small solutes to pass while restricting large proteins and cells.

Question 2

A patient presents with glucose in their urine. Which renal process has most likely failed, and why?

Accepted Answer

Tubular reabsorption, because the transport maximum for glucose has been exceeded.

Question 3

Which of the following equations correctly represents the calculation for Net Filtration Pressure (NFP) in the glomerulus?

Accepted Answer

$$NFP = HP_{gc} - (HP_{cs} + OP_{gc})$$

Question 4

Which structure is responsible for the majority of water and solute reabsorption in the nephron?

Accepted Answer

Proximal convoluted tubule

Question 5

A patient with chronic hypertension is at risk for which of the following kidney complications due to increased glomerular blood pressure?

Accepted Answer

Damage to glomerular capillaries and proteinuria

Question 6

Which of the following best explains why the efferent arteriole is narrower than the afferent arteriole in the glomerulus?

Accepted Answer

To increase hydrostatic pressure and promote filtration

Question 7

Which hormone increases water reabsorption in the collecting ducts, and what is the physiological result during dehydration?

Accepted Answer

Antidiuretic hormone (ADH); decreased urine volume

Question 8

Which of the following is a function of the juxtaglomerular complex (JGC)?

Accepted Answer

Regulation of glomerular filtration rate and blood pressure

Question 9

Which of the following best describes the countercurrent multiplier mechanism in the nephron loop?

Accepted Answer

It creates a medullary osmotic gradient by active transport of NaCl in the ascending limb and water reabsorption in the descending limb.

Question 10

A patient is unable to voluntarily control urination after a spinal cord injury. Which structure is most likely affected?

Accepted Answer

External urethral sphincter

Question 11

Which of the following is NOT normally found in urine under healthy conditions?

Accepted Answer

Glucose

Question 12

Which of the following best describes the path of blood flow through the kidney, starting from the renal artery?

Accepted Answer

Renal artery → segmental artery → interlobar artery → arcuate artery → cortical radiate artery → afferent arteriole → glomerulus → efferent arteriole

Question 13

Which of the following is the primary force driving glomerular filtration?

Accepted Answer

Hydrostatic pressure in the glomerular capillaries

Question 14

Which of the following is a consequence of a GFR less than 15 ml/min?

Accepted Answer

Renal failure and uremia

Question 15

Which of the following best explains why the kidneys are considered retroperitoneal organs?

Accepted Answer

They lie between the dorsal body wall and the parietal peritoneum.

Question 16

Which of the following is a function of the peritubular capillaries?

Accepted Answer

Absorption of water and solutes from the renal tubule

Question 17

Which of the following is the correct sequence for urine flow from the renal pyramid to the ureter?

Accepted Answer

Renal pyramid → minor calyx → major calyx → renal pelvis → ureter

Question 18

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

It increases sodium reabsorption in the distal convoluted tubule and collecting duct.

Question 19

A patient with a history of kidney stones is advised to stay hydrated. What is the physiological rationale for this advice?

Accepted Answer

Hydration dilutes the urine, reducing the risk of crystallization of solutes.

The Urinary System: Structure and Function

Study Guide - Practice Questions