Question 1

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

Accepted Answer

To filter blood, reabsorb essential substances, and secrete wastes into urine

Question 2

The glomerular filtration rate (GFR) is directly proportional to which of the following?

Accepted Answer

Net filtration pressure (NFP)

Question 3

Which of the following equations correctly calculates the net filtration pressure (NFP) in the glomerulus?

Accepted Answer

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

Question 4

A patient with severe dehydration is likely to have which of the following changes in their urine?

Accepted Answer

Increased urine osmolality and decreased urine volume

Question 5

Which structure is responsible for the secretion of renin in response to low blood pressure?

Accepted Answer

Juxtaglomerular cells

Question 6

Which of the following best explains why the ascending limb of the loop of Henle is impermeable to water?

Accepted Answer

It allows for the reabsorption of NaCl without water, helping to create a medullary osmotic gradient

Question 7

Which of the following is a consequence of aldosterone secretion?

Accepted Answer

Increased NaCl reabsorption in the distal convoluted tubule

Question 8

A patient presents with glucose in their urine (glycosuria). Which of the following best explains this finding?

Accepted Answer

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

Question 9

Which of the following substances is used to measure renal clearance because it is freely filtered, not reabsorbed, and not secreted?

Accepted Answer

Inulin

Question 10

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

Accepted Answer

It increases the number of aquaporins in the collecting duct, increasing water reabsorption

Question 11

Which of the following is the correct order of structures that urine passes through from the nephron to the external environment?

Accepted Answer

Collecting duct → renal pelvis → ureter → urinary bladder → urethra

Question 12

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

Question 13

Which of the following would most likely result in proteinuria (protein in the urine)?

Accepted Answer

Damage to the glomerular filtration membrane

Question 14

Which of the following is TRUE regarding the difference between the internal and external urethral sphincters?

Accepted Answer

The internal sphincter is composed of smooth muscle and is involuntarily controlled, while the external sphincter is skeletal muscle and voluntarily controlled

Question 15

A patient with a urinary tract infection is most likely to have which abnormal finding in their urine?

Accepted Answer

Leukocytes (pyuria)

Question 16

Which of the following best explains why the right kidney is slightly lower than the left?

Accepted Answer

The presence of the liver on the right side displaces the right kidney downward

Question 17

Which of the following is the main driving force for glomerular filtration?

Accepted Answer

Glomerular hydrostatic pressure

Question 18

Which of the following is a function of the urinary system besides urine formation?

Accepted Answer

Regulation of blood volume and blood pressure

Question 19

Which of the following best describes the effect of sympathetic nervous system activation on the kidneys during severe stress?

Accepted Answer

Vasoconstriction of afferent arterioles, leading to decreased GFR

Question 20

Which of the following is TRUE regarding the countercurrent multiplier system in the nephron loop?

Accepted Answer

It establishes an osmotic gradient in the medulla, allowing for the concentration of urine

The Urinary System: Structure, Function, and Physiology

Study Guide - Practice Questions

Study Guide - Flashcards