Question 1

Which of the following best describes the function of the external urethral sphincter in both males and females?

Accepted Answer

It is a circular band of skeletal muscle that acts as a valve under voluntary control.

Question 2

A patient presents with glucose in their urine. If their plasma glucose concentration is measured at 200 mg/dl, which physiological concept explains this finding?

Accepted Answer

The renal threshold for glucose has been exceeded, leading to glycosuria.

Question 3

Which of the following is a likely reason why infants lack voluntary control over urination?

Accepted Answer

Their central nervous system connections are not mature.

Question 4

A 70-year-old patient is experiencing increased urination and incontinence. Which age-related change in the urinary system is most likely responsible?

Accepted Answer

Reduced sensitivity to antidiuretic hormone (ADH)

Question 5

Which of the following best explains why kidney stones can cause severe pain?

Accepted Answer

They obstruct the ureter, causing increased pressure and stretching of urinary tract walls.

Question 6

A patient with diabetes develops ketoacidosis. Which of the following best describes the underlying cause?

Accepted Answer

The body lacks sufficient glucose/glycogen, leading to increased ketone production and decreased blood pH.

Question 7

Which of the following statements about the male and female urethra is correct?

Accepted Answer

The female urethra is approximately 3-4 cm long, while the male urethra is about 20 cm long.

Question 8

A patient is prescribed a diuretic. Which of the following physiological effects is most likely to occur?

Accepted Answer

Decrease in blood volume, blood pressure, and extracellular fluid volume

Question 9

If the renal threshold for amino acids is 65 mg/dl, what is the most likely outcome after a protein-rich meal?

Accepted Answer

Amino acids will appear in the urine, a condition called aminoaciduria.

Question 10

Which of the following best describes the process of micturition (urination) in adults?

Accepted Answer

It involves voluntary relaxation of the external urethral sphincter after sensory signals reach the cerebral cortex.

Question 11

A male patient is experiencing difficulty urinating due to an enlarged prostate gland. What is the most likely physiological explanation?

Accepted Answer

The prostate gland compresses the urethra, restricting urine flow and causing urinary retention.

Question 12

Which of the following equations best represents the relationship between urine output and diuretic therapy?

Accepted Answer

$$U = U_0$ + \Delta U_{diuretic}$$

Question 13

Which of the following is a correct statement about the renal threshold for glucose?

Accepted Answer

It is approximately 180 mg/dl, above which glucose appears in the urine.

Question 14

A patient with a urinary tract infection (UTI) is most likely to have which of the following findings?

Accepted Answer

Bacterial multiplication in the bladder or kidney

Question 15

Which of the following best explains why elderly individuals are more prone to urinary incontinence?

Accepted Answer

Decline in number of functional nephrons, reduced ADH sensitivity, and failing motor nerve reflexes

Question 16

Which of the following best describes the path of urine from the kidneys to the external environment?

Accepted Answer

Renal pelvis → ureter → urinary bladder → urethra

Question 17

Which of the following is a likely consequence if the plasma concentration of glucose is 220 mg/dl?

Accepted Answer

Glucose will appear in the urine because the renal threshold is exceeded.

Question 18

Which of the following best explains the mechanism of dialysis in patients with kidney failure?

Accepted Answer

Dialysis uses a semipermeable membrane to allow diffusion of waste products such as urea from blood into dialysis fluid.

Question 19

A patient with starvation-induced ketoacidosis will most likely have which of the following laboratory findings?

Accepted Answer

Decreased blood pH and increased ketone bodies in the urine

Question 20

Which of the following best describes the effect of diuretic therapy on blood pressure?

Accepted Answer

Diuretic therapy decreases blood pressure by promoting water loss in urine.

Urinary System: Ureters to Urethra, Physiology, and Clinical Considerations

Study Guide - Practice Questions

Study Guide - Flashcards