Question 1

Which of the following best describes the primary function of the nephron in the kidney?

Accepted Answer

It filters blood plasma, reabsorbs useful substances, and secretes wastes to form urine.

Question 2

A patient presents with a blood urea nitrogen (BUN) level significantly above normal. Which of the following is the most likely explanation?

Accepted Answer

Renal insufficiency leading to decreased excretion of nitrogenous wastes

Question 3

Which of the following correctly describes the effect of aldosterone on the distal convoluted tubule (DCT) and collecting duct?

Accepted Answer

It increases sodium reabsorption and water retention, decreasing urine volume.

Question 4

Which of the following is a direct result of the afferent arteriole being wider than the efferent arteriole in the glomerulus?

Accepted Answer

Increased glomerular hydrostatic pressure, favoring filtration

Question 5

A person stranded at sea drinks salt water. Which physiological process will ultimately lead to their death?

Accepted Answer

The kidneys cannot excrete urine with a higher osmolarity than seawater, leading to dehydration.

Question 6

Which of the following substances is NOT normally found in significant amounts in the urine of a healthy individual?

Accepted Answer

Glucose

Question 7

Which of the following best explains why the medullary portion of the collecting duct is able to concentrate urine?

Accepted Answer

It is more permeable to water than to NaCl, and the surrounding interstitial fluid is highly concentrated.

Question 8

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

Accepted Answer

$$NFP = (HP_g - OP_b - HP_c)$$

Question 9

A patient with diabetes insipidus is likely to have which of the following symptoms?

Accepted Answer

Polyuria due to ADH hyposecretion

Question 10

Which of the following is a function of the peritubular capillaries in the nephron?

Accepted Answer

They reabsorb water and solutes from the renal tubule back into the blood.

Question 11

Which of the following best describes the difference between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have long loops of Henle that extend deep into the medulla, allowing for greater urine concentration.

Question 12

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

Accepted Answer

Albumin

Question 13

Which hormone is released in response to dehydration and increases water reabsorption in the collecting duct?

Accepted Answer

Antidiuretic hormone (ADH)

Question 14

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

Accepted Answer

Severe pain and possible hematuria

Question 15

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

Accepted Answer

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

Question 16

Which of the following is a likely effect of caffeine on the urinary system?

Accepted Answer

It dilates the afferent arteriole, increasing GFR and urine output.

Question 17

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

Accepted Answer

Movement of solutes from the blood into the tubule for excretion

Question 18

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

Accepted Answer

Renal corpuscle → PCT → nephron loop → DCT → collecting duct → minor calyx → major calyx → renal pelvis → ureter → urinary bladder → urethra

Question 19

Which of the following best explains why strenuous exercise can result in proteinuria or hematuria?

Accepted Answer

Exercise increases glomerular permeability, allowing proteins and blood cells to enter the filtrate.

Urinary System: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica