$$ GFR = \frac{C_u \times V}{P} $$

Question 1

Which of the following best describes the primary mechanism for glucose reabsorption in the proximal convoluted tubule (PCT)?

Accepted Answer

Active transport via sodium-glucose cotransporters

Question 2

A patient presents with glycosuria (glucose in the urine). Which nephron segment is most likely malfunctioning?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 3

Which equation best represents the osmotic gradient established by the nephron loop (Loop of Henle)?

Accepted Answer

$$ \Delta C = C_{medulla} - C_{cortex} $$

Question 4

Which of the following is a direct effect of aldosterone on the nephron?

Accepted Answer

Increased sodium reabsorption in the DCT and collecting duct

Question 5

If antidiuretic hormone (ADH) is absent, what will be the expected outcome for urine volume and concentration?

Accepted Answer

Large volume, dilute urine

Question 6

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

Accepted Answer

It contains tight junctions that prevent water movement

Question 7

A patient with excessive aldosterone secretion would most likely exhibit which of the following electrolyte imbalances?

Accepted Answer

Hypokalemia

Question 8

Which process is primarily responsible for the secretion of hydrogen ions into the tubular fluid in the DCT?

Accepted Answer

Countertransport with sodium ions

Question 9

Which of the following best describes the effect of ADH on the collecting duct?

Accepted Answer

Increases permeability to water, resulting in concentrated urine

Question 10

Which of the following is the correct sequence of filtrate flow through the nephron?

Accepted Answer

Glomerulus → PCT → Nephron loop → DCT → Collecting duct

Question 11

Which mechanism is responsible for the majority of sodium reabsorption in the PCT?

Accepted Answer

Sodium-potassium ATPase pump

Question 12

A patient is given a drug that blocks the action of ADH. What is the expected effect on the collecting duct?

Accepted Answer

Decreased water reabsorption

Question 13

Which of the following best explains the countercurrent multiplication in the nephron loop?

Accepted Answer

The interaction between the descending and ascending limbs to establish an osmotic gradient

Question 14

Which equation best represents the relationship between glomerular filtration rate (GFR), urine concentration ($$C_u$$), and urine flow rate ($$V$$)?

Accepted Answer

$$ GFR = \frac{C_u 	imes V}{P} $$

Question 15

Which of the following substances is primarily secreted into the tubular fluid in the PCT?

Accepted Answer

Hydrogen ions

Question 16

A patient with diabetes insipidus is unable to produce ADH. What is the most likely effect on their urine?

Accepted Answer

Large volume of dilute urine

Question 17

Which of the following is a function of the distal convoluted tubule (DCT)?

Accepted Answer

Reabsorption of sodium and chloride ions under aldosterone stimulation

Question 18

Which of the following best describes the effect of the vasa recta on the medullary osmotic gradient?

Accepted Answer

It maintains the gradient by removing water and solutes without dissipating the gradient

Question 19

Which of the following is the primary driving force for water reabsorption in the descending limb of the nephron loop?

Accepted Answer

Osmotic gradient in the medulla

Nephron Physiology: Structure and Function of Renal Tubules

Study Guide - Practice Questions