Question 1

Which of the following best describes the role of the juxtaglomerular apparatus in kidney function?

Accepted Answer

It monitors blood pressure and sodium concentration, releasing renin to initiate the renin-angiotensin-aldosterone system.

Question 2

A patient presents with high blood pressure and low plasma protein levels. Predict how these changes would affect glomerular filtration rate (GFR).

Accepted Answer

GFR would increase because higher blood pressure raises hydrostatic pressure and lower plasma protein reduces oncotic pressure, both favoring filtration.

Question 3

Which equation correctly calculates Net Filtration Pressure (NFP) in the renal corpuscle?

Accepted Answer

$$NFP = P_{GC} - (P_{BS} + \pi_{GC})$$

Question 4

Which hormone increases sodium reabsorption in the distal tubule, thereby increasing blood pressure?

Accepted Answer

Aldosterone

Question 5

A patient is dehydrated and has concentrated urine. Which hormone is most likely elevated?

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

Which of the following best explains the transport maximum (Tm) for glucose in the nephron?

Accepted Answer

It is the maximum rate at which glucose can be reabsorbed from the filtrate, determined by the number of transport proteins.

Question 7

Which of the following ions is found in highest concentration in the intracellular fluid compartment?

Accepted Answer

Potassium ($$K^+)$$

Question 8

A patient with metabolic acidosis will compensate by which of the following mechanisms?

Accepted Answer

Increasing renal reabsorption of $$HCO_3$$^-$$ and excretion of H$$^+$$

Question 9

Which of the following is a direct effect of Angiotensin II?

Accepted Answer

Stimulation of aldosterone release from the adrenal cortex

Question 10

Which structure is responsible for the majority of water reabsorption in the nephron?

Accepted Answer

Proximal convoluted tubule

Question 11

A patient with preeclampsia presents with proteinuria and hypertension. Which kidney structure is most likely compromised?

Accepted Answer

Glomerular filtration barrier

Question 12

Which of the following best describes the effect of Atrial Natriuretic Peptide (ANP) on kidney function?

Accepted Answer

It decreases sodium reabsorption, leading to increased urine output and lower blood pressure.

Question 13

Which of the following equations correctly represents the relationship between $$CO_2$$, $$H_2O$$, $$H_2CO_3$$, $$H^+$$, and $$HCO_3$$^-$$ in acid-base balance?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-$$

Question 14

Which of the following would most likely result from a decrease in afferent arteriole diameter?

Accepted Answer

A decrease in glomerular filtration rate (GFR)

Question 15

Which of the following is the primary function of the loop of Henle in the nephron?

Accepted Answer

Creation of a concentration gradient in the medulla to facilitate water reabsorption

Question 16

A patient with respiratory acidosis will show which of the following compensatory responses?

Accepted Answer

Increased renal reabsorption of $$HCO_3$$^-$$

Question 17

Which of the following best describes the thirst mechanism?

Accepted Answer

It is triggered by increased plasma sodium concentration and decreased plasma volume, stimulating the hypothalamus.

Question 18

Which of the following is a major source of acid in the body?

Accepted Answer

Metabolism of carbohydrates producing $$CO_2$$

Question 19

Which of the following best explains the effect of ADH on the collecting duct?

Accepted Answer

It increases the permeability of the collecting duct to water, resulting in more concentrated urine.

Urinary System: Structure, Function, and Regulation – Study Guide

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