Urinary System Practice Quiz (15 questions)

1. Which set correctly describes the organs of the urinary system?

A. One kidney, two ureters, one urinary bladder, and two urethras

B. Two kidneys, one ureter, two urinary bladders, and one urethra

C. Two kidneys, two ureters, one urinary bladder, and one urethra

D. Two kidneys, two ureters, two urinary bladders, and one urethra

Answer: (C)

Explanation

The urinary system consists of two kidneys and two ureters, together with one bladder and one urethra. A second bladder is not part of the system's listed organ arrangement.

2. Which kidney region collects urine and funnels it into the ureter?

A. The renal medulla

B. The renal cortex

C. The renal pelvis

D. The renal columns

Answer: (C)

Explanation

The renal pelvis collects urine and directs it into the ureter. The cortex and medulla are associated with renal columns and pyramids, respectively, rather than serving as the urine-collecting funnel.

3. A patient has impaired kidney function; which group of functions could be affected?

A. Blood volume, electrolyte and acid-base balance, blood pressure, red blood cell production, and nitrogenous waste excretion

B. Blood volume, hormone digestion, acid-base balance, oxygen transport, and carbon dioxide excretion

C. Blood oxygenation, bile production, electrolyte balance, blood pressure, and digestion of dietary fats

D. Blood pressure, nutrient absorption, red blood cell breakdown, bile storage, and nitrogenous waste production

Answer: (A)

Explanation

Kidneys regulate blood volume, electrolytes, acid-base balance, blood pressure, and red blood cell production, while excreting nitrogenous waste. Bile production and dietary-fat digestion are not among the kidney functions described.

4. What is the nephron, and what two broad components make it up?

A. The kidney's filtering membrane, made up of renal pyramids and collecting ducts

B. The kidney's urine reservoir, made up of the renal pelvis and ureters

C. The kidney's functional unit, made up of renal tubules and renal blood vessels

D. The kidney's outer covering, made up of the renal capsule and renal cortex

Answer: (C)

Explanation

The nephron is the functional unit of the kidney and consists of renal tubules and renal blood vessels. The renal pelvis and ureters carry or collect urine but do not constitute the nephron.

5. Which sequence lists the components of the renal tubules?

A. Renal artery, proximal convoluted tubule, loop of Henle, renal vein, and collecting duct

B. Glomerular capsule, proximal convoluted tubule, renal pelvis, distal convoluted tubule, and ureter

C. Glomerular capsule, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct

D. Glomerular capsule, renal pelvis, renal artery, distal convoluted tubule, and collecting duct

Answer: (C)

Explanation

The renal tubules comprise the glomerular capsule, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct. The renal pelvis, ureter, and major kidney blood vessels are not components of that tubular sequence.

6. Which three processes together form urine?

A. Tubular filtration, glomerular reabsorption, and renal secretion

B. Glomerular secretion, tubular filtration, and urinary excretion

C. Glomerular filtration, tubular storage, and tubular concentration

D. Glomerular filtration, tubular reabsorption, and tubular secretion

Answer: (D)

Explanation

Urine formation consists of glomerular filtration, tubular reabsorption, and tubular secretion. Storage and concentration are not the three processes identified as making up urine formation.

7. A substance moves from the renal tubules into the peritubular capillaries, mainly in the proximal convoluted tubule; what process is occurring?

A. Urinary excretion, which transfers filtrate from the collecting duct to the blood

B. Tubular reabsorption, which returns selected filtrate components to the blood

C. Glomerular filtration, which transfers water and solutes into Bowman's capsule

D. Tubular secretion, which moves selected blood components into the tubules

Answer: (B)

Explanation

Tubular reabsorption returns filtrate from the renal tubules to the blood in the peritubular capillaries and occurs mostly in the proximal convoluted tubule. Tubular secretion is the plausible alternative, but it moves substances into the tubules rather than into the blood.

8. How does aldosterone affect the distal tubule and upper collecting duct?

A. It decreases sodium and water reabsorption, raising urine concentration and blood pressure

B. It increases sodium and water reabsorption, raising blood volume and blood pressure

C. It increases sodium excretion and water loss, lowering blood volume and blood pressure

D. It increases potassium reabsorption while reducing sodium and water reabsorption

Answer: (B)

Explanation

Aldosterone acts on the distal tubule and upper collecting duct to increase sodium and water reabsorption, which raises blood volume and blood pressure. Increased sodium excretion would oppose the effect described for aldosterone.

9. When low blood pressure activates the renin-angiotensin-aldosterone system, what sequence leads to increased sodium and water reabsorption?

A. The kidney releases renin, angiotensinogen becomes angiotensin I, lung-released converting enzyme produces angiotensin II, and the adrenal cortex releases aldosterone

B. The kidney releases renin, angiotensinogen becomes angiotensin II directly, and the posterior pituitary releases aldosterone

C. The lungs release renin, the adrenal cortex converts angiotensinogen to angiotensin I, and the kidney releases aldosterone

D. The kidney releases aldosterone, angiotensin I becomes angiotensinogen, and the lungs release renin to produce angiotensin II

Answer: (A)

Explanation

Low blood pressure stimulates renal renin release, followed by conversion of angiotensinogen to angiotensin I and then angiotensin II, which leads to adrenal aldosterone release. The lungs release the converting enzyme, not renin, and the posterior pituitary is not the source of aldosterone.

10. When low blood volume or high concentration triggers ADH release, how does ADH help conserve water?

A. It moves water from the collecting duct into tissue spaces and peritubular capillaries, decreasing water excretion and concentrating urine

B. It moves sodium from the collecting duct into tissue spaces, increasing sodium excretion and diluting urine

C. It moves potassium from the collecting duct into tissue spaces, decreasing potassium excretion and diluting urine

D. It moves water from peritubular capillaries into the collecting duct, increasing water excretion and concentrating urine

Answer: (A)

Explanation

ADH promotes water movement from the collecting duct into tissue spaces and then peritubular capillaries, reducing water excretion and producing concentrated urine. Sodium excretion is associated with natriuretic peptides, not the water-conserving effect of ADH.

11. A patient produces 350 mL of urine in 24 hours. How is this urine output classified?

A. Polyuria, because the output is below the average daily volume

B. Average output, because it is close to 1500 mL per 24 hours

C. Oliguria, because the output is below 400 mL per 24 hours

D. Polyuria, because the output is above 1500 mL per 24 hours

Answer: (C)

Explanation

Oliguria is urine output below 400 mL per 24 hours, so 350 mL meets that definition. Polyuria refers to output above 1500 mL per 24 hours, not output below the average.

12. A person’s kidneys continue producing urine, but the bladder does not empty. Which condition does this describe?

A. Renal suppression, which occurs when the bladder fails to empty

B. Renal suppression, which may be treated with catheterization or drugs

C. Urinary retention, which may be treated with catheterization or drugs

D. Urinary retention, which results from the kidneys ceasing urine production

Answer: (C)

Explanation

Urinary retention occurs when urine is produced by the kidneys but the bladder does not empty, and treatment may include catheterization or drugs. Renal suppression involves a lack of urine production by the kidneys and is treated with dialysis.

13. A patient’s kidneys stop producing urine, and uremia develops. Which condition and treatment are associated with this situation?

A. Urinary retention treated with dialysis

B. Renal suppression treated with bladder catheterization

C. Renal suppression treated with dialysis

D. Urinary retention treated with drugs

Answer: (C)

Explanation

Renal suppression occurs when the kidneys do not produce urine, which can lead to uremia, and its treatment is dialysis. Urinary retention instead involves failure of the bladder to empty despite continued urine production.

14. Which structure carries urine from the bladder to the outside of the body?

A. The renal pelvis

B. The ureter

C. The urinary sphincter

D. The urethra

Answer: (D)

Explanation

The urethra is the tube that carries urine from the bladder to the outside of the body. The ureters carry urine toward the bladder rather than from the bladder out of the body.

15. As the bladder fills during micturition, which sequence leads to bladder emptying?

A. Stretch receptors signal the spinal cord, sensory signals return, and the bladder relaxes as the internal sphincter contracts

B. Stretch receptors signal the spinal cord, motor signals return, and the bladder contracts as the internal sphincter relaxes

C. The bladder contracts first, then stretch receptors signal the spinal cord and the internal sphincter tightens

D. The internal sphincter relaxes before bladder filling stimulates receptors, and sensory signals travel from the spinal cord to the bladder

Answer: (B)

Explanation

Bladder filling stimulates stretch receptors, sensory signals travel to the spinal cord, and motor signals return to trigger bladder contraction and internal sphincter relaxation. The sequence does not involve the bladder relaxing while the internal sphincter contracts.