Question 1

Which of the following best describes the primary 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 a medication that inhibits the action of antidiuretic hormone (ADH). What is the most likely effect on their urine output?

Accepted Answer

Urine output will increase, producing more dilute urine.

Question 4

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

Accepted Answer

Aldosterone

Question 5

What is the main nitrogenous waste product excreted by the kidneys, and how is it formed?

Accepted Answer

Urea, formed in the liver from ammonia produced by amino acid metabolism

Question 6

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 7

A person is severely dehydrated. Which hormone will be released in greater amounts to help conserve water, and what effect will it have on the collecting ducts?

Accepted Answer

Antidiuretic hormone (ADH); increases permeability of collecting ducts to water

Question 8

Which of the following is a direct effect of angiotensin II in the renin-angiotensin system?

Accepted Answer

It causes vasoconstriction, raising blood pressure.

Question 9

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

Accepted Answer

Proximal tubule

Question 10

A patient is prescribed an ACE inhibitor for hypertension. What is the mechanism by which this medication lowers blood pressure?

Accepted Answer

It blocks the conversion of angiotensin I to angiotensin II, reducing aldosterone secretion and increasing sodium and water excretion.

Question 11

Which of the following best describes the role of atrial natriuretic hormone (ANH) in the regulation of blood volume?

Accepted Answer

It inhibits sodium reabsorption, leading to increased sodium and water excretion.

Question 12

Which of the following equations correctly represents the relationship between blood pH and hydrogen ion concentration?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[\mathrm{H}^+]$$

Question 13

Which of the following scenarios would most likely trigger the release of erythropoietin from the kidneys?

Accepted Answer

A decrease in blood oxygen levels

Question 14

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

Accepted Answer

Synthesis of digestive enzymes

Question 15

If the afferent arteriole leading to the glomerulus constricts, what will happen to the glomerular filtration rate (GFR)?

Accepted Answer

GFR will decrease due to reduced blood flow into the glomerulus.

Question 16

Which of the following substances is typically NOT found in the filtrate produced by the glomerulus?

Accepted Answer

Red blood cells

Question 17

A person consumes a large amount of salty food but drinks little water. Which hormonal response will help restore homeostasis?

Accepted Answer

Increased release of ADH to promote water reabsorption

Question 18

Which of the following best explains why diuretics are used to treat high blood pressure?

Accepted Answer

They increase water and sodium excretion, reducing blood volume and pressure.

Question 19

Which step in urine formation is responsible for the selective removal of drugs and toxins from the blood into the nephron tubule?

Accepted Answer

Tubular secretion

Question 20

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

It increases sodium reabsorption in the distal tubule and collecting duct, causing water to follow by osmosis.

Urinary System: Structure, Function, and Regulation

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