Question 1

Which of the following best describes the process of glomerular filtration in the nephron?

Accepted Answer

It is a passive process driven by hydrostatic pressure, allowing water and small solutes to pass through the filtration membrane.

Question 2

A patient presents with proteinuria and edema. Which of the following best explains the underlying mechanism?

Accepted Answer

Increased permeability of the filtration membrane allows plasma proteins to enter the filtrate, reducing plasma oncotic pressure and causing fluid to accumulate in tissues.

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

Increased hydrostatic pressure in the capsular space

Question 5

A patient with severe hemorrhage is likely to experience which of the following changes in renal function?

Accepted Answer

Decreased GFR due to sympathetic nervous system activation and afferent arteriole constriction

Question 6

Which hormone increases water reabsorption in the collecting duct by increasing the number of aquaporins?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

Which of the following substances is primarily reabsorbed in the proximal convoluted tubule (PCT)?

Accepted Answer

All glucose and amino acids

Question 8

What is the main function of aldosterone in the distal convoluted tubule and collecting duct?

Accepted Answer

Increase sodium reabsorption and potassium secretion

Question 9

Which of the following best describes the difference between obligatory and facultative water reabsorption?

Accepted Answer

Obligatory reabsorption occurs where aquaporins are always present, while facultative reabsorption depends on ADH.

Question 10

A patient with diabetes mellitus has glucose in their urine. What is the most likely explanation?

Accepted Answer

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

Question 11

Which of the following is NOT a normal constituent of urine?

Accepted Answer

Plasma proteins

Question 12

Which of the following best describes the role of tubular secretion?

Accepted Answer

It moves specific substances from the blood into the filtrate, including drugs, excess K+, and H+.

Question 13

Which hormone is released in response to low blood calcium and increases calcium reabsorption in the distal convoluted tubule?

Accepted Answer

Parathyroid hormone (PTH)

Question 14

Which of the following is a likely consequence of chronic renal disease (GFR \u003c 60 mL/min for at least three months)?

Accepted Answer

Metabolic acidosis due to accumulation of acids

Question 15

Which of the following best explains why kidney stones (renal calculi) can cause severe pain?

Accepted Answer

They obstruct urine flow, causing increased pressure and pain radiating from the flank to the abdomen.

Question 16

Which of the following is the correct sequence of events for micturition (urination)?

Accepted Answer

Contraction of detrusor muscle, opening of internal urethral sphincter, opening of external urethral sphincter

Question 17

Which of the following would most likely be found in the urine of a patient with glomerulonephritis?

Accepted Answer

Blood cells and proteins

Question 18

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

Accepted Answer

It inhibits sodium reabsorption, increasing water loss and lowering blood volume and pressure.

Question 19

Which of the following is a function of the glomerular mesangial cells?

Accepted Answer

They engulf macromolecules that get stuck in the filtration membrane.

Question 20

Which of the following best explains why lipid-soluble drugs are difficult to excrete in the urine?

Accepted Answer

They are reabsorbed passively along with water down their concentration gradients.

The Urinary System: Filtration, Reabsorption, Secretion, and Urine Properties

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