Question 1

Which of the following is a primary function of the kidneys in maintaining homeostasis?

Accepted Answer

Regulating the total water volume and solute concentration in the body

Question 2

A patient is given intravenous albumin. What is the expected effect on the net filtration pressure (NFP) in the glomerulus?

Accepted Answer

NFP would decrease due to increased colloid osmotic pressure

Question 3

Which structure is responsible for the majority of nutrient and ion reabsorption in the nephron?

Accepted Answer

Proximal convoluted tubule

Question 4

The countercurrent multiplier mechanism in the nephron loop is essential for:

Accepted Answer

Establishing the osmotic gradient in the renal medulla

Question 5

Which hormone increases water reabsorption in the collecting ducts by stimulating the insertion of aquaporins?

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

A diabetic patient presents with glucose in the urine. This is best explained by:

Accepted Answer

The transport maximum (Tm) for glucose reabsorption has been exceeded

Question 7

Which of the following equations correctly represents the calculation for net filtration pressure (NFP) in the glomerulus?

Accepted Answer

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

Question 8

Which of the following would most likely occur if the afferent arteriole constricts in response to increased blood pressure?

Accepted Answer

Glomerular filtration rate (GFR) would decrease

Question 9

A patient with high blood potassium levels will experience increased secretion of which hormone, and what is its effect?

Accepted Answer

Aldosterone; increases potassium secretion and sodium reabsorption

Question 10

Which of the following best describes the role of the vasa recta in the kidney?

Accepted Answer

It acts as a countercurrent exchanger to maintain the medullary osmotic gradient

Question 11

Which of the following is NOT a function of the juxtaglomerular complex (JGC)?

Accepted Answer

Secreting erythropoietin in response to low oxygen

Question 12

Which process in the nephron is most important for regulating blood pH?

Accepted Answer

Tubular secretion

Question 13

A patient is prescribed a loop diuretic. What is the primary mechanism by which this drug increases urine output?

Accepted Answer

It inhibits the formation of the medullary osmotic gradient

Question 14

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

Accepted Answer

Decreased sodium reabsorption, leading to decreased blood volume

Question 15

Which of the following best explains why the osmolarity of the renal medulla is much higher than that of plasma?

Accepted Answer

Both the countercurrent multiplier and urea recycling contribute solutes to the interstitial fluid

Question 16

Which of the following is NOT a layer of the ureter wall?

Accepted Answer

Endothelium

Question 17

Which feature of the urinary bladder allows it to stretch and relax repeatedly as it fills and empties?

Accepted Answer

The walls are highly folded into rugae and the epithelium is transitional

Question 18

Which of the following events is NOT required for micturition (urination) to occur?

Accepted Answer

Contraction of the internal urethral sphincter by the somatic nervous system

Question 19

Which of the following best describes the functional difference between the male and female urethra?

Accepted Answer

The male urethra is shared with the reproductive system

Question 20

A patient with a kidney stone blocking the ureter is at risk for which of the following complications?

Accepted Answer

Obstruction of urine flow and severe pain radiating from the flank to the abdomen

The Urinary System: Structure, Function, and Physiology

Study Guide - Practice Questions