Question 1

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

Accepted Answer

They filter nitrogenous wastes, excess solutes, and water from the blood to form urine.

Question 2

Which process in the nephron is responsible for the movement of protein-free fluid and solutes from the blood into the glomerular capsule?

Accepted Answer

Glomerular filtration

Question 3

A patient is given an ACE inhibitor to treat high blood pressure. What is the primary effect of this medication on the renin-angiotensin system?

Accepted Answer

It blocks the conversion of angiotensin I to angiotensin II, lowering blood pressure.

Question 4

Which hormone increases the permeability of the collecting ducts to water, resulting in more concentrated urine?

Accepted Answer

Antidiuretic hormone (ADH)

Question 5

If a person consumes a large amount of water, which of the following will occur in their kidneys?

Accepted Answer

ADH secretion decreases, and less water is reabsorbed.

Question 6

Which region of the nephron is primarily responsible for the reabsorption of glucose, amino acids, and most bicarbonate?

Accepted Answer

Proximal tubule

Question 7

A person is experiencing dehydration. Which of the following physiological responses will occur to restore homeostasis?

Accepted Answer

Increased ADH release, leading to decreased urine output

Question 8

Which of the following best explains why the kidneys play a critical role in maintaining acid-base balance in the body?

Accepted Answer

They reabsorb filtered bicarbonate and excrete hydrogen ions as ammonium.

Question 9

Which of the following substances is NOT typically secreted into the nephron tubule during tubular secretion?

Accepted Answer

Glucose

Question 10

A patient has a genetic defect that prevents the production of aquaporins in the collecting ducts. What is the most likely consequence?

Accepted Answer

The patient will be unable to reabsorb water efficiently, resulting in large volumes of dilute urine.

Question 11

Which of the following is the correct sequence for the path of urine from its formation to excretion?

Accepted Answer

Renal pelvis → Ureter → Bladder → Urethra

Question 12

Which hormone is released by the adrenal glands and increases sodium reabsorption in the distal tubule and collecting duct?

Accepted Answer

Aldosterone

Question 13

Which of the following best describes the effect of atrial natriuretic hormone (ANH) on the kidneys?

Accepted Answer

It inhibits sodium reabsorption, causing increased sodium and water excretion.

Question 14

Which of the following is a direct effect of angiotensin II in the body?

Accepted Answer

Stimulates aldosterone release, increasing sodium and water reabsorption

Question 15

A person with chronic kidney disease is unable to produce sufficient erythropoietin. What is a likely consequence?

Accepted Answer

Decreased red blood cell production, leading to anemia

Question 16

Which of the following best explains why the glomerular filtration rate (GFR) decreases during periods of high sympathetic nervous system activity?

Accepted Answer

The afferent arterioles constrict, reducing blood flow to the kidneys.

Question 17

Which of the following is a function of the urinary system that helps maintain homeostasis?

Accepted Answer

Regulation of water and salt balance

Question 18

Which of the following best describes the role of the loop of Henle in the nephron?

Accepted Answer

It establishes a concentration gradient in the medulla, allowing for water reabsorption.

Question 19

A person is given a diuretic medication. What is the expected effect on their urine output and why?

Accepted Answer

Urine output increases because less water is reabsorbed.

Question 20

Which of the following equations correctly represents the conversion of ammonia to urea in the liver?

Accepted Answer

$$\mathrm{2NH_3 + CO_2$ \rightarrow (NH_2$)_2CO + H_2O}$$

The Urinary System: Structure, Function, and Regulation

Study Guide - Practice Questions