Question 1

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

Accepted Answer

Synthesizing insulin for glucose regulation

Question 2

A patient presents with blood in the urine (hematuria) after a car accident. Which anatomical feature makes the right kidney more susceptible to trauma?

Accepted Answer

The right kidney is lower and less protected by the thoracic cage

Question 3

Which layer of tissue directly prevents the spread of infection to the kidney?

Accepted Answer

Fibrous capsule

Question 4

What is the correct sequence of urine flow from the renal pyramid to the ureter?

Accepted Answer

Renal pyramid → minor calyx → major calyx → renal pelvis → ureter

Question 5

Which type of nephron is primarily responsible for the production of concentrated urine?

Accepted Answer

Juxtamedullary nephron

Question 6

A patient with acute nephritis is experiencing anuria. What is the most likely physiological explanation?

Accepted Answer

Nephrons have stopped functioning, leading to very low urinary output

Question 7

Which cell type in the collecting duct is responsible for maintaining acid-base balance in the blood?

Accepted Answer

Intercalated cells

Question 8

Which of the following pressures is the main force driving glomerular filtration?

Accepted Answer

Hydrostatic pressure in glomerular capillaries ($$HP_g)$$

Question 9

Calculate the net filtration pressure ($$NFP) in $$the glomerulus if the hydrostatic pressure in glomerular capillaries is 55 mm Hg, the hydrostatic pressure in the capsular space is 15 mm Hg, and the colloid osmotic pressure in capillaries is 30 mm Hg. Use the formula $$NFP = HP_g - (HP_{cs} + OP_c).$$

Accepted Answer

$$NFP = 55 - (15 + 30) = 10 mm Hg$$

Question 10

Which of the following mechanisms is responsible for the kidney's ability to maintain a nearly constant glomerular filtration rate (GFR) when mean arterial pressure (MAP) is between 80 and 180 mm Hg?

Accepted Answer

Renal autoregulation (intrinsic control)

Question 11

A patient is dehydrated, leading to low blood pressure. Which response will the kidneys initiate to restore blood pressure?

Accepted Answer

Increase renin release, leading to systemic vasoconstriction

Question 12

Which part of the nephron is composed of cuboidal cells with dense microvilli and is primarily responsible for reabsorption and secretion?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 13

Which of the following best describes the role of the macula densa cells in the juxtaglomerular complex?

Accepted Answer

They act as chemoreceptors sensing NaCl content in filtrate

Question 14

Which of the following is TRUE regarding glomerular capillaries?

Accepted Answer

They are fed and drained by arterioles

Question 15

A patient has proteinuria (protein in urine). What does this most likely indicate about the filtration membrane?

Accepted Answer

The filtration membrane is allowing macromolecules to pass

Question 16

Which of the following capillary beds is associated with juxtamedullary nephrons and is crucial for the formation of concentrated urine?

Accepted Answer

Vasa recta

Question 17

Which process in urine formation is responsible for selectively moving substances from blood to filtrate in renal tubules and collecting ducts?

Accepted Answer

Tubular secretion

Question 18

If the afferent arteriole constricts, what is the expected effect on glomerular filtration rate (GFR)?

Accepted Answer

GFR decreases due to reduced hydrostatic pressure

Question 19

Which of the following is a direct effect of increased sympathetic nervous system activity on the kidneys during severe blood loss?

Accepted Answer

Constriction of afferent arterioles and decreased GFR

Question 20

Which equation correctly represents the calculation of net filtration pressure ($$NFP) in $$the glomerulus?

Accepted Answer

$$NFP = HP_g - (HP_{cs} + OP_c)$$

Anatomy & Physiology: The Urinary System – Structure and Function of the Kidneys 1

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