Question 1

Which of the following best describes the difference between chemical digestion and mechanical digestion?

Accepted Answer

Chemical digestion uses enzymes to break down macromolecules into monomers, while mechanical digestion physically breaks food into smaller pieces without altering chemical structure.

Question 2

Which of the following is the correct sequence for the formation and elimination of urine, starting at the glomerulus and ending at the urethra?

Accepted Answer

Glomerulus → Proximal convoluted tubule → Loop of Henle → Distal convoluted tubule → Collecting duct → Ureter → Bladder → Urethra

Question 3

Which hormone increases water reabsorption in the kidneys by increasing the permeability of the collecting ducts, and what is its effect on urine output?

Accepted Answer

ADH (antidiuretic hormone); decreases urine output

Question 4

A patient presents with muscle weakness and swelling. Laboratory tests reveal low plasma protein levels. What is the most likely diagnosis and the key sign you would expect to see?

Accepted Answer

Hypoproteinemia; edema

Question 5

Which of the following best describes the role of dietary fats in the human body?

Accepted Answer

They provide essential fatty acids and are necessary for absorption of fat-soluble vitamins.

Question 6

Which enzyme is secreted by the pancreas and is responsible for breaking down triglycerides into fatty acids and glycerol?

Accepted Answer

Lipase

Question 7

Which of the following is the correct order of the three major processes of cellular respiration?

Accepted Answer

Glycolysis → Krebs cycle → Electron transport chain

Question 8

A patient is diagnosed with metabolic acidosis. Which of the following laboratory findings would you expect?

Accepted Answer

Decreased blood pH and decreased bicarbonate ($$\mathrm{$$HCO_3$$^-})$$

Question 9

Which of the following best explains how ACE inhibitors lower blood pressure?

Accepted Answer

They block the conversion of angiotensin I to angiotensin II, resulting in vasodilation and decreased aldosterone secretion.

Question 10

Which of the following is a function of hepatocytes in the liver?

Accepted Answer

Production of bile

Question 11

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

Accepted Answer

It creates a concentration gradient in the medulla to allow for water reabsorption.

Question 12

Which of the following statements about cholesterol is correct?

Accepted Answer

Cholesterol is necessary for cell membrane structure and hormone synthesis, but excess LDL cholesterol can be harmful.

Question 13

Which of the following best describes peristaltic waves?

Accepted Answer

They are rhythmic, involuntary contractions of smooth muscle that propel contents through the digestive tract.

Question 14

Which of the following is a key difference between diabetes mellitus and diabetes insipidus?

Accepted Answer

Diabetes mellitus involves high blood glucose due to insulin issues, while diabetes insipidus involves problems with ADH leading to excessive dilute urine.

Question 15

Which of the following best explains the benefit of omega-3 fatty acids and HDL in the diet?

Accepted Answer

Omega-3 fatty acids reduce inflammation and HDL helps remove cholesterol from the bloodstream.

Question 16

Which of the following enzymes is secreted in the stomach and is responsible for protein digestion?

Accepted Answer

Pepsin

Question 17

A patient is experiencing rapid, deep breathing and confusion. Blood gas analysis shows low $$\mathrm{CO_2$}$$ and high blood pH. What is the most likely diagnosis?

Accepted Answer

Respiratory alkalosis

Question 18

Which of the following best describes the function of bile in digestion?

Accepted Answer

Bile emulsifies fats, increasing their surface area for lipase action.

Question 19

Which of the following is a key sign that distinguishes heat stroke from heat exhaustion?

Accepted Answer

Hot, dry skin and altered mental status

Question 20

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

Accepted Answer

It increases sodium reabsorption in the distal convoluted tubule, leading to increased water retention and higher blood pressure.

Digestive, Metabolic, and Renal Physiology: Key Concepts and Processes

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