$$\text{NFP} = \text{HP}_{\text{GC}} - (\text{HP}_{\text{CS}} + \text{OP}_{\text{GC}})$$

Question 1

Which of the following is NOT a function of the urinary system?

Accepted Answer

Regulation of blood glucose by gluconeogenesis during fasting

Question 2

The hormone renin, secreted by the kidneys, ultimately leads to which of the following physiological effects?

Accepted Answer

Increased blood pressure by vasoconstriction and aldosterone secretion

Question 3

Which region of the nephron is primarily responsible for the reabsorption of approximately 65% of filtered water and solutes?

Accepted Answer

Proximal convoluted tubule

Question 4

A patient presents with proteinuria and hematuria. Which structure is most likely damaged?

Accepted Answer

Glomerular filtration membrane

Question 5

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

Accepted Answer

$$	ext{NFP} = 	ext{HP}_{	ext{GC}} - (	ext{HP}_{	ext{CS}} + 	ext{OP}_{	ext{GC}})$$

Question 6

Which of the following best describes the permeability of the nephron loop (loop of Henle)?

Accepted Answer

Descending limb is permeable to water but not solutes; ascending limb is permeable to solutes but not water

Question 7

A patient with a blood pH of 7.25, $$	ext{PCO}_2 of 55 $$mmHg, and $$	ext{HCO}_3^- of 32 $$mEq/L is experiencing which acid-base disturbance?

Accepted Answer

Respiratory acidosis, compensated

Question 8

Which hormone increases the number of aquaporins in the collecting duct, thereby increasing water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

Which of the following substances would NOT normally be found in healthy urine?

Accepted Answer

Glucose

Question 10

Which structure is responsible for the production of erythropoietin (EPO) in response to hypoxia?

Accepted Answer

Kidney

Question 11

Which of the following best describes the role of the vasa recta in the kidney?

Accepted Answer

It acts as the countercurrent exchanger, preserving the medullary osmotic gradient

Question 12

Which of the following is the most important chemical buffer system for maintaining normal blood pH?

Accepted Answer

Bicarbonate buffer system

Question 13

Which of the following best describes the effect of increased sympathetic tone on glomerular filtration rate (GFR)?

Accepted Answer

Reduction in GFR

Question 14

Which of the following is a correct sequence for the flow of urine from its formation to excretion?

Accepted Answer

Renal cortex → Renal medulla → Renal pelvis → Ureter → Bladder → Urethra

Question 15

Which of the following is a function of the juxtaglomerular complex (JGC)?

Accepted Answer

Monitoring NaCl concentration in the filtrate and releasing renin

Question 16

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

Increases sodium reabsorption and potassium secretion in the distal tubule and collecting duct

Question 17

Which of the following is true regarding the physical characteristics of healthy urine?

Accepted Answer

Healthy urine has a slightly higher specific gravity compared to pure water

Question 18

Which of the following best describes the process of ammoniagenesis in the kidney?

Accepted Answer

Conversion of glutamine into bicarbonate and ammonium ion

Question 19

Which of the following is NOT a normal response to increased parasympathetic tone during micturition?

Accepted Answer

External urethral sphincter contracts

Urinary System and Acid-Base Balance: Structure, Function, and Regulation

Study Guide - Practice Questions