Question 1

Which of the following best describes the primary function of the nephron in the kidney?

Accepted Answer

It filters blood, reabsorbs needed substances, and secretes wastes for elimination.

Question 2

A patient presents with a serum creatinine level of 2.0 mg/dL. Based on the study materials, what does this most likely indicate about their kidney function?

Accepted Answer

About 90% of kidney function is lost.

Question 3

Which segment of the nephron is primarily responsible for reabsorbing water and solutes immediately after filtration in Bowman's capsule?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 4

Which hormone increases the permeability of the collecting duct to water, thereby concentrating urine when body fluids are too concentrated?

Accepted Answer

Antidiuretic hormone (ADH)

Question 5

A patient is prescribed a thiazide diuretic. What is the primary site of action for this medication in the nephron?

Accepted Answer

Distal convoluted tubule

Question 6

Which of the following equations correctly represents the calculation of renal clearance ($$C) $$for a substance?

Accepted Answer

$$C = \frac{U 	imes V}{P}$$

Question 7

Which of the following is NOT a normal characteristic of urine?

Accepted Answer

Contains large amounts of plasma proteins

Question 8

Which capillary system in the nephron is responsible for reabsorbing needed substances back into the blood?

Accepted Answer

Peritubular capillary system

Question 9

Aldosterone antagonists are known as potassium-sparing diuretics. What is their main effect in the nephron?

Accepted Answer

Reduce sodium reabsorption and increase potassium secretion

Question 10

Which of the following factors would most likely increase the glomerular filtration rate (GFR)?

Accepted Answer

Increased glomerular capillary hydrostatic pressure

Question 11

Which endocrine function of the kidney is responsible for stimulating red blood cell production in response to low oxygen levels?

Accepted Answer

Erythropoietin

Question 12

A patient with nephrotic syndrome is likely to have which type of urinary cast due to high protein concentration and low urine pH?

Accepted Answer

Hyaline casts

Question 13

Which of the following best explains why the kidneys are able to produce urine with a specific gravity as high as 1.030?

Accepted Answer

High concentration of solutes in the urine due to water reabsorption

Question 14

Which process in the nephron involves the movement of substances from the blood into the tubular fluid to be eliminated?

Accepted Answer

Secretion

Question 15

Which of the following diagnostic tests is most useful for directly visualizing the inside of the bladder and urethra?

Accepted Answer

Cystoscopy

Question 16

The renin-angiotensin-aldosterone system (RAAS) primarily helps regulate which physiological parameter?

Accepted Answer

Blood pressure

Question 17

Which of the following is a function of the kidney in acid-base balance?

Accepted Answer

Secreting hydrogen ions ($$H^+) $$and reabsorbing bicarbonate ($$HCO_3$$^-$$)

Question 18

A patient with a GFR of 50 mL/min/1.73 m$$^2 is $$most likely experiencing which condition?

Accepted Answer

Moderate to severe kidney dysfunction

Question 19

Which of the following best describes the role of the Na$$^+/K$^+$$ ATPase pump in renal tubular cells?

Accepted Answer

It keeps sodium concentration low inside the cell, creating a gradient for sodium transport.

Question 20

Which of the following is a direct effect of active vitamin D (calcitriol) produced by the kidney?

Accepted Answer

Increases calcium absorption from the gut

32 Patho

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