Question 1

Which of the following is NOT a major function of the kidneys?

Accepted Answer

Production of insulin to regulate blood glucose

Question 2

Which organ is responsible for filtering fluid from the bloodstream to remove metabolic wastes and toxins, and return vital ions and water to the blood?

Accepted Answer

Kidney

Question 3

Which of the following nitrogenous wastes is produced from the catabolism of nucleic acids?

Accepted Answer

Uric acid

Question 4

A patient presents with elevated blood urea nitrogen (BUN) and symptoms of vomiting, dyspnea, and cardiac arrhythmia. What is the most likely diagnosis?

Accepted Answer

Uremia

Question 5

Which of the following correctly traces the flow of filtrate from its formation to its exit from the body?

Accepted Answer

Glomerular capsule → proximal convoluted tubule → nephron loop → distal convoluted tubule → collecting duct → papillary duct → minor calyx → major calyx → renal pelvis → ureter → urinary bladder → urethra

Question 6

Which of the following statements about the filtration membrane in the glomerulus is TRUE?

Accepted Answer

It consists of fenestrated endothelium, basement membrane, and filtration slits formed by podocytes

Question 7

Which of the following molecules is LEAST likely to pass through the glomerular filtration membrane?

Accepted Answer

Albumin

Question 8

Which of the following best explains why the glomerular hydrostatic pressure (BHP) is higher in glomerular capillaries compared to other capillaries?

Accepted Answer

The afferent arteriole is larger than the efferent arteriole, creating a bottleneck effect

Question 9

Calculate the net filtration pressure (NFP) in the glomerulus if the glomerular hydrostatic pressure is $$60\ \mathrm{mm\ Hg}$$, the capsular hydrostatic pressure is $$18\ \mathrm{mm\ Hg}$$, and the glomerular colloid osmotic pressure is $$32\ \mathrm{mm\ Hg}.$$

Accepted Answer

$$NFP = 60 - (18 + 32) = 10\ \mathrm{mm\ Hg}$$

Question 10

Which of the following is a distinguishing feature of juxtamedullary nephrons compared to cortical nephrons?

Accepted Answer

Juxtamedullary nephrons have long nephron loops that extend deep into the medulla and help maintain the salinity gradient

Question 11

Which of the following substances is reabsorbed in the proximal convoluted tubule (PCT) by both transcellular and paracellular routes?

Accepted Answer

Water

Question 12

A patient with a blood glucose level of $$250\ \mathrm{mg/dL} is $$found to have glucose in their urine. Which renal concept explains this finding?

Accepted Answer

Renal threshold for glucose has been exceeded, and the transport maximum (Tm) for glucose reabsorption is saturated

Question 13

Which hormone acts on the distal convoluted tubule and collecting duct to increase sodium reabsorption and potassium secretion?

Accepted Answer

Aldosterone

Question 14

Which of the following mechanisms is responsible for the kidney's ability to concentrate urine?

Accepted Answer

Countercurrent multiplier in the nephron loop and urea recycling in the medulla

Question 15

Which of the following would most likely result in an increase in glomerular filtration rate (GFR)?

Accepted Answer

Dilation of the afferent arteriole

Question 16

Which hormone is secreted in response to dehydration and increases the permeability of the collecting duct to water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 17

Which of the following is TRUE regarding the role of the vasa recta in the kidney?

Accepted Answer

It maintains the osmotic gradient in the medulla by countercurrent exchange, allowing water reabsorbed from the collecting duct to be returned to the bloodstream

Question 18

Which of the following best describes the process of tubular secretion in the nephron?

Accepted Answer

Movement of solutes from the peritubular capillaries into the tubular fluid

Question 19

Which of the following is a consequence of a glomerular filtration rate (GFR) that is too low?

Accepted Answer

Reabsorption of wastes, leading to azotemia

Urinary System: Structure, Function, and Filtration Mechanisms

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