Q: Which equation correctly represents the net filtration pressure (NFP) in the glomerulus?

$$\text{NFP} = \text{HPg} - (\text{OPg} + \text{HPc})$$

Question 1

Which of the following best describes the function of the juxtaglomerular apparatus (JG) in the nephron?

Accepted Answer

It regulates filtrate formation and systemic blood pressure.

Question 2

A patient with diabetes mellitus has a blood glucose concentration of 300 mg/dL. If the renal threshold for glucose is 200 mg/dL and the transport maximum (Tm) is exceeded, what will happen to the excess glucose?

Accepted Answer

It will be excreted in the urine, causing glucosuria.

Question 3

Which equation correctly represents the net filtration pressure (NFP) in the glomerulus?

Accepted Answer

$$	ext{NFP} = 	ext{HPg} - (	ext{OPg} + 	ext{HPc})$$

Question 4

Which of the following would most likely result in proteinuria?

Accepted Answer

Damage to the glomerular filtration membrane allowing excessive plasma protein filtration.

Question 5

A patient is given a loop diuretic to treat hypertension. Which of the following best explains how loop diuretics increase urine output?

Accepted Answer

They inhibit sodium transport in the nephron loop, reducing the concentration gradient and osmotic pressure for water reabsorption.

Question 6

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

Accepted Answer

The descending limb is permeable to water but impermeable to salt; the ascending limb is impermeable to water and actively pumps salt out.

Question 7

Which hormone increases the number of Na+/K+ pumps and Na+ channels in principal cells of the collecting tubules and ducts, thereby increasing sodium and water reabsorption?

Accepted Answer

Aldosterone

Question 8

A patient has a mean arterial blood pressure of 70 mmHg. What is the most likely effect on glomerular filtration rate (GFR)?

Accepted Answer

GFR will decrease, leading to accumulation of metabolic wastes.

Question 9

Which of the following is a function of type A intercalated cells in the collecting tubules?

Accepted Answer

They eliminate H+ to decrease urine pH and reabsorb HCO3− into the blood.

Question 10

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

Accepted Answer

It inhibits renin release, relaxes mesangial cells, and increases filtration membrane surface area, resulting in increased GFR and urine volume.

Question 11

Which of the following substances is freely filtered at the glomerulus, with half reabsorbed at the proximal convoluted tubule and half excreted in the urine?

Accepted Answer

Urea

Question 12

Which anatomical structure is responsible for storing urine until it is eliminated from the body?

Accepted Answer

Urinary bladder

Question 13

Which of the following is TRUE regarding the specific gravity of urine?

Accepted Answer

A specific gravity below 1.010 indicates hydration.

Question 14

Which of the following is a consequence of renal ptosis?

Accepted Answer

Kinking of the ureter, leading to hydronephrosis and potential renal failure.

Question 15

Which of the following is the correct sequence for the flow of filtrate through the nephron and associated structures?

Accepted Answer

Glomerular capsule → PCT → Nephron loop → DCT → Collecting tubule → Collecting duct

Question 16

Which of the following best describes the effect of parathyroid hormone (PTH) on the kidney?

Accepted Answer

It inhibits phosphate reabsorption and stimulates calcium reabsorption.

Question 17

Which of the following is TRUE regarding the innervation of the urinary bladder and urethral sphincters?

Accepted Answer

Parasympathetic neurons stimulate contraction of the detrusor muscle and relaxation of the internal urethral sphincter.

Question 18

A renal plasma clearance test is performed for a drug that is both filtered and secreted but not reabsorbed. If the GFR is 125 ml/min, what can be inferred about the renal plasma clearance of the drug?

Accepted Answer

It will be greater than the GFR.

Question 19

Which of the following is a characteristic of the filtration membrane in the renal corpuscle?

Accepted Answer

It is negatively charged and restricts passage of large proteins and formed elements.

The Urinary System: Structure, Function, and Regulation

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