Question 1

Which of the following correctly traces the path of blood flow through the kidney, from the renal artery to the glomerulus?

Accepted Answer

Renal artery → segmental artery → interlobar artery → arcuate artery → interlobular (cortical radiate) artery → afferent arteriole → glomerulus

Question 2

Which of the following best describes the three major processes in urine formation?

Accepted Answer

Filtration, reabsorption, and secretion

Question 3

A patient is experiencing severe dehydration. Which hormone will be released to increase water reabsorption in the kidneys, and what is its primary mechanism?

Accepted Answer

Antidiuretic hormone (ADH); increases water permeability of the collecting ducts

Question 4

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

Accepted Answer

$$\mathrm{NFP} = (P_{GC} - P_{BC}) - \pi_{GC}$$

Question 5

Which of the following statements best distinguishes between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have longer nephron loops that extend deep into the medulla, allowing for the production of concentrated urine.

Question 6

A patient with high blood pressure is given a drug that inhibits the renin-angiotensin-aldosterone system (RAAS). What is the expected effect on glomerular filtration rate (GFR)?

Accepted Answer

GFR will decrease due to dilation of the efferent arteriole.

Question 7

Which of the following best explains why the differential permeability of the nephron loop is necessary for urine concentration?

Accepted Answer

It allows for the creation of an osmotic gradient in the medulla, enabling water reabsorption from the collecting duct.

Question 8

Which of the following is the correct sequence for the path of filtrate through the nephron and collecting system?

Accepted Answer

Glomerular capsule → proximal convoluted tubule → nephron loop → distal convoluted tubule → collecting duct

Question 9

Which of the following best describes the effect of hyperventilation on blood pH?

Accepted Answer

Blood pH increases (alkalosis) due to decreased $$\mathrm{PCO}_2$$

Question 10

A patient presents with metabolic acidosis. Which compensatory mechanism will the body use to help restore normal pH?

Accepted Answer

Increase respiratory rate to decrease $$\mathrm{PCO}_2$$

Question 11

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

Accepted Answer

It maintains the osmotic gradient in the medulla by acting as a countercurrent exchanger.

Question 12

Which of the following statements about the buffer systems in the body is correct?

Accepted Answer

The bicarbonate buffer system helps maintain blood pH by the reversible reaction: $$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \leftrightarrow \mathrm{H}_2\mathrm{CO}_3 \leftrightarrow \mathrm{H}^+ + \mathrm{HCO}_3^-$$

Question 13

Which of the following best describes the difference between filtrate, tubular fluid, and urine?

Accepted Answer

Filtrate is the fluid in the glomerular capsule, tubular fluid is in the renal tubule, and urine is in the collecting duct and beyond.

Question 14

Which of the following best explains how the kidneys respond to respiratory alkalosis?

Accepted Answer

They excrete more bicarbonate ions and retain hydrogen ions.

Question 15

Which of the following is a correct statement about the regulation of sodium ion concentration in the plasma?

Accepted Answer

Aldosterone increases sodium reabsorption in the distal tubule and collecting duct.

Question 16

A patient with chronic kidney disease has a measured GFR of 40 mL/min. Which of the following best describes this value?

Accepted Answer

It is significantly below the normal average GFR of $$125\ \mathrm{mL/min}$$, indicating impaired kidney function.

Question 17

Which of the following best describes the micturition reflex?

Accepted Answer

It is a spinal reflex that causes contraction of the detrusor muscle and relaxation of the internal urethral sphincter.

Question 18

Which of the following best explains why a patient with uncontrolled diabetes mellitus may have glucose present in their urine?

Accepted Answer

The transport maximum for glucose reabsorption in the proximal tubule is exceeded.

Question 19

Which of the following best describes the relationship between calcium and phosphate ion regulation?

Accepted Answer

Parathyroid hormone (PTH) increases blood calcium levels while decreasing blood phosphate levels.

The Urinary System and Fluid, Electrolyte, and Acid-Base Homeostasis

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