Urinary System Practice Quiz (9 questions)

1. Which group contains the four organs of excretion?

A. Kidneys, sweat glands, lungs, and intestines

B. Kidneys, liver, lungs, and urinary bladder

C. Lungs, urinary bladder, urethra, and kidneys

D. Sweat glands, ureters, intestines, and liver

Answer: (A)

Explanation

The four organs of excretion are the kidneys, sweat glands, lungs, and intestines. The urinary bladder is part of the urinary system, but it is not one of the four organs in this list.

2. Which set correctly describes the organs that make up the urinary system?

A. Two kidneys, two ureters, two urinary bladders, and the urethra

B. Two kidneys, two ureters, the urinary bladder, and the urethra

C. Two kidneys, the lungs, the urinary bladder, and the urethra

D. Two kidneys, two urethras, the urinary bladder, and the intestines

Answer: (B)

Explanation

The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra. The intestines are an organ of excretion, but they are not one of the urinary system's components.

3. Where are the kidneys located in relation to the abdominal cavity and peritoneum?

A. On the posterior abdominal wall, behind the parietal peritoneum

B. Below the abdominal cavity, behind the pelvic peritoneum

C. Within the abdominal cavity, between the visceral and parietal peritoneum

D. On the anterior abdominal wall, in front of the parietal peritoneum

Answer: (A)

Explanation

The kidneys lie on the posterior wall of the abdominal cavity, behind the parietal peritoneum. Their position is not in front of the parietal peritoneum, as one of the alternatives suggests.

4. A person's kidneys excrete less water while maintaining electrolyte regulation; which role of the kidneys does this illustrate?

A. Regulating blood volume by controlling water excretion and helping regulate blood electrolytes

B. Regulating blood volume by controlling urea production and helping regulate blood oxygen

C. Regulating blood acidity by controlling bile excretion and helping regulate blood proteins

D. Regulating blood pressure by controlling red-cell production and helping regulate blood glucose

Answer: (A)

Explanation

The kidneys regulate blood volume by determining how much water is excreted and also help regulate the blood's electrolyte content. Urea production and oxygen regulation do not describe this paired function.

5. What does tubular reabsorption mean in urine formation?

A. Movement of selected substances from the blood into the renal tubules

B. Removal of urine from the bladder through the urethra

C. Movement of water and dissolved substances from the tubules into the blood of peritubular capillaries

D. Passage of filtrate from the glomerulus into the renal tubules

Answer: (C)

Explanation

Tubular reabsorption returns water and dissolved substances from the filtrate in the tubules to the blood in peritubular capillaries. Tubular secretion is a plausible alternative, but it moves selected substances in the opposite direction, from blood into the tubules.

6. What proportion of urine is composed of water?

A. About 95%

B. About 75%

C. About 65%

D. About 85%

Answer: (A)

Explanation

Urine is composed mostly of water, which accounts for about 95% of its volume. The remaining portion includes nitrogen-containing wastes and electrolytes, so estimates such as 85% understate the water proportion.

7. What is the primary role of the ureters in the urinary tract?

A. They store urine until it is released from the body.

B. They trigger the bladder’s contraction during urination.

C. They carry urine from the bladder to the outside of the body.

D. They carry urine from the kidneys to the urinary bladder.

Answer: (D)

Explanation

The ureters transport urine from the kidneys to the bladder. The urethra carries urine from the bladder out of the body, so that role belongs to a different structure.

8. How do the meanings of renal and urology differ?

A. Renal concerns the bladder, whereas urology concerns urine production.

B. Renal concerns excretion generally, whereas urology concerns the kidneys.

C. Renal concerns the urinary system, whereas urology concerns kidney function.

D. Renal concerns the kidneys, whereas urology concerns the urinary system.

Answer: (D)

Explanation

Renal refers specifically to the kidney, while urology concerns the urinary system as a whole. Urology is not limited to kidney function, which is the distinction associated with renal physiology and nephrology.

9. If kidney function declines and nitrogenous wastes are not adequately excreted, what consequence can result?

A. Nitrogenous waste can accumulate in the blood, causing uremia.

B. Blood pH increases because the kidneys excrete less water.

C. Blood volume can rise because the kidneys retain more electrolytes.

D. Urine becomes more concentrated because the kidneys secrete erythropoietin.

Answer: (A)

Explanation

The kidneys excrete nitrogenous wastes such as urea and creatinine, and their retention in the blood is associated with uremia. Changes in water excretion can affect blood volume, but they do not define this consequence of waste retention.