$$\text{NFP} = \text{GHP} - (\text{GCOP} + \text{CHP})$$

Question 1

Which of the following best describes the main function of the nephron in the kidney?

Accepted Answer

It filters blood, reabsorbs needed substances, and secretes wastes to form urine.

Question 2

A patient presents with glycosuria and polyuria. Which of the following best explains the underlying mechanism?

Accepted Answer

The transport maximum for glucose reabsorption in the proximal tubule has been exceeded.

Question 3

Which of the following would most likely result in an increase in glomerular filtration rate (GFR)?

Accepted Answer

Vasodilation of the afferent arteriole

Question 4

A patient with chronic hypertension is prescribed an ACE inhibitor. What is the primary effect of this medication on the kidney?

Accepted Answer

It blocks angiotensin-converting enzyme, reducing efferent arteriole constriction and lowering glomerular hydrostatic pressure.

Question 5

Which of the following is NOT a function of the kidneys?

Accepted Answer

Synthesis of insulin

Question 6

A patient is found to have a high plasma creatinine level. Which of the following is the most likely explanation?

Accepted Answer

Decreased glomerular filtration rate

Question 7

Which of the following best describes the effect of antidiuretic hormone (ADH) on the collecting duct?

Accepted Answer

It increases the permeability of the collecting duct to water by inserting aquaporins.

Question 8

Which of the following equations correctly represents the net filtration pressure (NFP) at the glomerulus?

Accepted Answer

$$	ext{NFP} = 	ext{GHP} - (	ext{GCOP} + 	ext{CHP})$$

Question 9

A patient is experiencing severe dehydration. Which of the following changes would you expect in their urine?

Accepted Answer

Increased urine osmolarity and decreased urine volume

Question 10

Which of the following best explains why albumin is not normally found in the filtrate?

Accepted Answer

Albumin is too large to pass through the filtration slits formed by podocytes.

Question 11

Which of the following would most likely occur if the afferent arteriole of the glomerulus is constricted?

Accepted Answer

Glomerular hydrostatic pressure decreases and GFR decreases.

Question 12

Which of the following is a direct effect of aldosterone on the distal tubule and collecting duct?

Accepted Answer

Increased reabsorption of sodium ions and secretion of potassium ions

Question 13

A patient with syndrome of inappropriate ADH secretion (SIADH) is likely to have which of the following laboratory findings?

Accepted Answer

Low plasma osmolarity and high urine osmolarity

Question 14

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

Accepted Answer

It creates an osmotic gradient in the renal medulla by actively transporting NaCl out of the thick ascending limb.

Question 15

Which of the following is the correct sequence of blood flow through the kidney?

Accepted Answer

Renal artery → segmental artery → interlobar artery → arcuate artery → interlobular artery → afferent arteriole → glomerulus

Question 16

A patient is given a loop diuretic. Which of the following is the primary site of action for this drug?

Accepted Answer

Thick ascending limb of the nephron loop

Question 17

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

Accepted Answer

They are located posterior to the peritoneal membranes.

Question 18

Which of the following is a likely consequence of nephrolithiasis (kidney stones) blocking a ureter?

Accepted Answer

Renal colic, hematuria, and possible hydronephrosis

Question 19

Which of the following best describes the role of the vasa recta in the kidney?

Accepted Answer

It acts as a countercurrent exchanger to maintain the medullary osmotic gradient.

The Urinary System: Structure, Function, and Physiology

Study Guide - Practice Questions