Q: Which of the following equations correctly represents the calculation for the filtered load of a substance?

$$\text{Filtered Load} = \text{GFR} \times [\text{Substance}]_{\text{plasma}}$$

Q: Which of the following is the correct formula for renal clearance of a substance S?

$$C_S = \frac{U_S \times V}{P_S}$$

Question 1

Which of the following best describes the primary function of the kidneys?

Accepted Answer

Regulation of blood volume and pressure by maintaining water and ion balance

Question 2

A patient is found to have a plasma glucose concentration of 400 mg/100 mL. Which of the following best explains why glucose appears in their urine?

Accepted Answer

The filtered load of glucose exceeds the transport maximum (Tm) of SGLT transporters

Question 3

Which of the following changes would most likely increase the glomerular filtration rate (GFR)?

Accepted Answer

Dilation of the afferent arteriole

Question 4

A red blood cell is placed in a solution and begins to swell and eventually bursts. Which of the following best describes the tonicity of the solution?

Accepted Answer

Hypotonic

Question 5

Which of the following equations correctly represents the calculation for the filtered load of a substance?

Accepted Answer

$$	ext{Filtered Load} = 	ext{GFR} 	imes [	ext{Substance}]_{	ext{plasma}}$$

Question 6

Which of the following best explains why inulin clearance is used to measure glomerular filtration rate (GFR)?

Accepted Answer

Inulin is filtered but neither reabsorbed nor secreted

Question 7

A patient with nephrogenic diabetes insipidus will most likely present with which of the following symptoms?

Accepted Answer

High plasma osmolarity and large volume of dilute urine

Question 8

Which of the following best describes the mechanism by which aldosterone increases sodium reabsorption in the cortical collecting duct?

Accepted Answer

It increases the synthesis of sodium transport proteins in the tubular cells

Question 9

Which of the following is the correct formula for renal clearance of a substance S?

Accepted Answer

$$C_S = \frac{U_S 	imes V}{P_S}$$

Question 10

Which of the following best explains why the ascending limb of the loop of Henle is critical for creating a hyperosmotic medullary interstitium?

Accepted Answer

It is impermeable to water and actively reabsorbs NaCl

Question 11

A patient is experiencing metabolic acidosis due to severe diarrhea. Which of the following compensatory responses would you expect?

Accepted Answer

Increased ventilation and increased renal secretion of H$$^+$$

Question 12

Which of the following statements about the juxtaglomerular apparatus (JGA) is correct?

Accepted Answer

The macula densa senses sodium concentration and can signal for renin release

Question 13

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on sodium handling by the kidney?

Accepted Answer

ANP inhibits sodium reabsorption and increases GFR

Question 14

Which of the following best explains why water reabsorption in the proximal tubule is not physiologically regulated?

Accepted Answer

Aquaporin-1 channels are always open and not regulated by hormones

Question 15

Which of the following would most likely result in a decrease in the net glomerular filtration pressure?

Accepted Answer

Increase in Bowman’s space hydrostatic pressure

Question 16

Which of the following best describes the movement of sodium during reabsorption in the proximal tubule?

Accepted Answer

Sodium passively enters the cell across the apical membrane and is actively transported out across the basolateral membrane by the Na+/K+ pump

Question 17

A patient is given an ACE inhibitor to treat hypertension. Which of the following best explains how this medication lowers blood pressure?

Accepted Answer

It blocks the conversion of angiotensin I to angiotensin II, reducing aldosterone secretion and sodium reabsorption

Question 18

Which of the following best describes the fate of urea in the nephron?

Accepted Answer

Urea is freely filtered, partially reabsorbed, and partially secreted, with only about 15% excreted

Question 19

Which of the following best explains why the vasa recta are important for maintaining the medullary osmotic gradient?

Accepted Answer

They maintain the gradient by countercurrent exchange, preventing washout of solutes

Renal Physiology: Structure, Function, and Regulation of the Kidneys

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