Question 1

Which of the following best describes the primary function of the kidneys in the urinary system?

Accepted Answer

They remove metabolic wastes from circulation and help maintain homeostasis.

Question 2

A patient presents with dark yellow urine and reports feeling thirsty and fatigued. Based on the urine color chart, what is the most likely physiological explanation?

Accepted Answer

The patient is dehydrated, resulting in concentrated urine due to increased reabsorption of water.

Question 3

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

Accepted Answer

Synthesis of digestive enzymes

Question 4

Which structure is responsible for the initial filtration of blood in the nephron?

Accepted Answer

Glomerulus within Bowman’s capsule

Question 5

A blockage in the efferent arteriole of the nephron would most directly affect which of the following pressures?

Accepted Answer

Glomerular hydrostatic pressure ($$GHP)$$

Question 6

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

Accepted Answer

$$NFP = GHP - (CsHP + BCOP)$$

Question 7

Which hormone increases sodium reabsorption in the distal convoluted tubule and collecting duct, and what is its effect on blood pressure?

Accepted Answer

Aldosterone; increases blood pressure

Question 8

A patient with metabolic acidosis will have which of the following renal responses?

Accepted Answer

Increased secretion of hydrogen ions and increased reabsorption of bicarbonate

Question 9

Which of the following best explains why the descending limb of the nephron loop is permeable to water but not to solutes?

Accepted Answer

It has aquaporins but lacks significant solute transporters.

Question 10

Which of the following is a direct effect of atrial natriuretic peptide (ANP) on the kidneys?

Accepted Answer

Decreased sodium reabsorption and increased urine output

Question 11

A patient with a duplicated ureter is most likely to experience which of the following?

Accepted Answer

Increased risk of urinary tract infections due to abnormal urine flow

Question 12

Which of the following best describes the process of tubular secretion in the nephron?

Accepted Answer

Active transport of substances from the blood into the tubular fluid

Question 13

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

Accepted Answer

Bowman’s capsule → Proximal convoluted tubule → Loop of Henle → Distal convoluted tubule → Collecting duct

Question 14

A patient with a blood pressure of 90/60 mm Hg is found to have a decreased glomerular filtration rate (GFR). Which mechanism is most likely responsible for this change?

Accepted Answer

Decreased glomerular hydrostatic pressure ($$GHP)$$

Question 15

Which of the following substances is typically NOT found in significant amounts in normal urine?

Accepted Answer

Glucose

Question 16

Which of the following best explains why patients with chronic kidney failure often require dialysis?

Accepted Answer

Dialysis replaces the kidney’s function of filtering metabolic wastes from the blood.

Question 17

Which of the following is a consequence of prolonged aldosterone stimulation in the kidneys?

Accepted Answer

Development of alkalosis due to excessive H+ secretion

Question 18

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

Accepted Answer

It maintains the concentration gradient in the medulla by absorbing water and solutes.

Question 19

A patient with a bladder infection (cystitis) is most likely to present with which of the following symptoms?

Accepted Answer

Frequent need to urinate, burning sensation, and cloudy urine

The Urinary System: Structure, Function, and Physiology

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