$$\text{NFP} = \text{Glomerular hydrostatic pressure} - (\text{Glomerular colloid osmotic pressure} + \text{Capsular hydrostatic pressure})$$

$$\text{pH} = \text{p}K_a + \log \left( \frac{[\text{HCO}_3^-]}{0.03 \times \text{PCO}_2} \right)$$

Question 1

Which of the following correctly traces the path of blood flow through the kidney, from largest to smallest arteries?

Accepted Answer

Renal artery \rightarrow Segmental artery \rightarrow Interlobar artery \rightarrow Arcuate artery \rightarrow Cortical radiate artery

Question 2

A patient presents with high blood pressure and decreased GFR. Which mechanism is most likely responsible for the decrease in GFR?

Accepted Answer

Increased sympathetic nervous system activity causing afferent arteriole constriction

Question 3

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

Accepted Answer

$$	ext{NFP} = 	ext{Glomerular hydrostatic pressure} - (	ext{Glomerular colloid osmotic pressure} + 	ext{Capsular hydrostatic pressure})$$

Question 4

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

Accepted Answer

Juxtamedullary nephrons have longer nephron loops that extend deep into the medulla, allowing for concentrated urine production.

Question 5

A patient with diabetes insipidus is unable to concentrate urine. Which hormone is most likely deficient?

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

Which of the following statements about the filtration membrane in the glomerulus is correct?

Accepted Answer

It consists of fenestrated capillary endothelium, a basement membrane, and podocyte filtration slits.

Question 7

Which process is primarily responsible for the movement of water from the nephron back into the blood?

Accepted Answer

Tubular reabsorption

Question 8

Which of the following would most likely cause the kidneys to produce dilute urine?

Accepted Answer

Decreased release of antidiuretic hormone (ADH)

Question 9

Which of the following is a correct sequence for the path of filtrate through the nephron?

Accepted Answer

Glomerular capsule \rightarrow Proximal convoluted tubule \rightarrow Nephron loop \rightarrow Distal convoluted tubule \rightarrow Collecting duct

Question 10

Which hormone increases sodium reabsorption in the distal convoluted tubule and collecting duct?

Accepted Answer

Aldosterone

Question 11

Which of the following best explains how the kidneys compensate for respiratory acidosis?

Accepted Answer

By increasing secretion of hydrogen ions and reabsorption of bicarbonate ions

Question 12

Which buffer system is most important for maintaining blood pH?

Accepted Answer

Bicarbonate buffer system

Question 13

A patient is hyperventilating. What effect will this have on blood pH?

Accepted Answer

Increase blood pH (alkalosis)

Question 14

Which equation correctly relates blood pH to $$	ext{PCO}_2$$ and bicarbonate ion concentration?

Accepted Answer

$$	ext{pH} = 	ext{p}K_a + \log \left( \frac{[	ext{HCO}_3^-]}{0.03 	imes 	ext{PCO}_2} ight)$$

Question 15

Which of the following is a major function of the kidneys?

Accepted Answer

Regulation of blood volume and composition

Question 16

Which structure is responsible for voluntary control of micturition?

Accepted Answer

External urethral sphincter

Question 17

Which of the following best describes the role of the vasa recta in urine concentration?

Accepted Answer

It maintains the medullary osmotic gradient by countercurrent exchange.

Question 18

Which of the following would most likely result in metabolic alkalosis?

Accepted Answer

Excessive vomiting leading to loss of gastric acid

Question 19

Which of the following is true regarding the relative concentrations of sodium and potassium in body fluid compartments?

Accepted Answer

Sodium is higher in extracellular fluid, while potassium is higher in intracellular fluid.

Question 20

Which of the following best describes the micturition reflex?

Accepted Answer

It is a spinal reflex triggered by stretch receptors in the bladder wall.

The Urinary System and Fluid, Electrolyte, and Acid-Base Homeostasis

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