Question 1

Which of the following best describes the main function of the juxtamedullary nephrons compared to cortical nephrons?

Accepted Answer

They have long loops of Henle that extend deep into the medulla, allowing for greater water retention and the production of concentrated urine.

Question 2

A patient presents with a blood pressure of 160/100 mmHg. Which of the following renal responses would you expect as a result of this elevated blood pressure?

Accepted Answer

Afferent arteriole constriction and increased release of atrial natriuretic peptide (ANP).

Question 3

Which equation correctly represents the calculation of Net Filtration Pressure (NFP) in the glomerulus?

Accepted Answer

$$NFP = GHP - (GCOP - CHP)$$

Question 4

A patient’s 24-hour urine collection shows a creatinine clearance rate significantly below normal. What does this most likely indicate?

Accepted Answer

Decreased renal function and possible renal failure

Question 5

Which of the following best explains why glucose is not normally found in the urine of healthy individuals?

Accepted Answer

Glucose is completely reabsorbed in the proximal convoluted tubule (PCT) via carrier-mediated transport, unless the transport maximum (TM) is exceeded.

Question 6

A patient is given a loop diuretic. Which part of the nephron is primarily affected, and what is the main effect?

Accepted Answer

Ascending limb of the nephron loop; inhibition of Na/K/Cl transport, leading to increased urinary output

Question 7

Which hormone increases the permeability of the distal convoluted tubule (DCT) and collecting duct to water by increasing the number of aquaporins?

Accepted Answer

Antidiuretic hormone (ADH)

Question 8

A patient with chronic hypertension is prescribed an ACE inhibitor. What is the primary mechanism by which this drug lowers blood pressure?

Accepted Answer

It blocks the conversion of angiotensin I to angiotensin II, reducing vasoconstriction and aldosterone secretion.

Question 9

Which of the following is a direct effect of atrial natriuretic peptide (ANP) on the kidneys?

Accepted Answer

Dilates afferent arterioles and constricts efferent arterioles, increasing GFR and promoting sodium and water loss

Question 10

A patient with diabetes mellitus has a blood glucose concentration that exceeds the transport maximum (TM) of the renal tubules. What is the most likely clinical finding?

Accepted Answer

Glycosuria (glucose in the urine)

Question 11

Which of the following best describes the countercurrent multiplier system in the nephron loop?

Accepted Answer

It creates a concentration gradient in the medulla by actively transporting NaCl out of the ascending limb, allowing water to be reabsorbed from the descending limb.

Question 12

Which of the following would most likely occur if the afferent arteriole of the glomerulus constricts while the efferent arteriole remains unchanged?

Accepted Answer

Glomerular filtration rate (GFR) decreases

Question 13

A patient is experiencing metabolic acidosis. Which renal process will help compensate for this condition?

Accepted Answer

Increased secretion of H+ ions and increased reabsorption of bicarbonate ions in the distal convoluted tubule and collecting duct.

Question 14

Which of the following is a characteristic of urine in a healthy individual?

Accepted Answer

Specific gravity between 1.001 and 1.035

Question 15

A patient with a kidney stone blocking the ureter is likely to experience which of the following changes in glomerular filtration?

Accepted Answer

Increased capsular hydrostatic pressure (CHP) and decreased GFR

Question 16

Which of the following best explains why urinary tract infections (UTIs) are more common in females than in males?

Accepted Answer

Females have a shorter urethra, allowing bacteria easier access to the bladder.

Question 17

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

Accepted Answer

Papillary duct → minor calyx → major calyx → renal pelvis → ureter → bladder → urethra

Question 18

Which of the following would be expected in a patient with chronic renal failure?

Accepted Answer

Decreased urine output and increased BUN levels

Question 19

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

It increases sodium reabsorption and potassium secretion in the distal convoluted tubule and collecting duct.

Question 20

A patient is unable to voluntarily control urination due to nerve damage affecting the external urethral sphincter. Which of the following best describes this condition?

Accepted Answer

Incontinence

The Urinary System: Structure, Function, and Regulation

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