Q: Which of the following best describes the role of aldosterone in the nephron?

Promotes synthesis of Na\textsuperscript{+} and K\textsuperscript{+} channels in principal cells, increasing Na\textsuperscript{+} reabsorption and K\textsuperscript{+} secretion

Question 1

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

Accepted Answer

Synthesis of insulin for glucose regulation

Question 2

A patient presents with proteinuria (protein in the urine). Which structure is most likely damaged?

Accepted Answer

Glomerular filtration membrane

Question 3

Which hormone directly increases the insertion of aquaporins in the collecting duct, leading to increased water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Question 4

What is the correct sequence of blood flow through the kidney?

Accepted Answer

Renal artery → Interlobar artery → Arcuate artery → Glomerulus → Efferent arteriole → Peritubular capillaries

Question 5

Which of the following best describes the role of aldosterone in the nephron?

Accepted Answer

Promotes synthesis of Na	extsuperscript{+} and K	extsuperscript{+} channels in principal cells, increasing Na	extsuperscript{+} reabsorption and K	extsuperscript{+} secretion

Question 6

Which pressure is primarily responsible for driving glomerular filtration?

Accepted Answer

Glomerular hydrostatic pressure

Question 7

If the net filtration pressure (NFP) in the glomerulus is $$10\ \mathrm{mm\ Hg}$$, and the glomerular filtration rate (GFR) is directly proportional to NFP, what would happen to GFR if NFP decreases to $$5\ \mathrm{mm\ Hg}$$?

Accepted Answer

GFR would decrease

Question 8

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

Accepted Answer

Renal autoregulation

Question 9

A patient is experiencing high blood pressure. Which hormone would be released by cardiac atrial cells to help lower blood pressure and blood volume?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 10

Which part of the nephron is primarily responsible for the reabsorption of glucose, amino acids, and most water?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 11

Which cells in the juxtaglomerular complex (JGC) sense blood pressure in the afferent arteriole and release renin?

Accepted Answer

Granular (juxtaglomerular) cells

Question 12

Which process in the nephron is described as the movement of substances from the blood into the filtrate, primarily occurring in the proximal convoluted tubule?

Accepted Answer

Tubular secretion

Question 13

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

Accepted Answer

$$\mathrm{NFP} = \mathrm{HP}_\mathrm{gc} - (\mathrm{OP}_\mathrm{gc} + \mathrm{HP}_\mathrm{cs})$$

Question 14

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

Accepted Answer

Dilation of afferent arteriole

Question 15

During prolonged fasting, which function of the kidney becomes especially important?

Accepted Answer

Gluconeogenesis

Question 16

Which of the following is TRUE regarding the vasa recta?

Accepted Answer

They are long, thin-walled vessels that run parallel to the nephron loops of juxtamedullary nephrons

Question 17

Which of the following would most likely occur if the afferent arteriole is constricted?

Accepted Answer

Decrease in glomerular hydrostatic pressure and GFR

Question 18

Which cells in the collecting duct are responsible for maintaining acid-base balance?

Accepted Answer

Intercalated cells

Question 19

Which of the following best describes the effect of the renin-angiotensin-aldosterone system (RAAS) on systemic blood pressure?

Accepted Answer

It increases systemic blood pressure by promoting vasoconstriction and Na	extsuperscript{+} reabsorption

The Urinary System: Structure, Function, and Regulation

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