Question 1

Which of the following best describes the difference between mechanical and chemical breakdown of food in the digestive system?

Accepted Answer

Mechanical breakdown is the physical fragmentation of food into smaller pieces, while chemical breakdown involves enzymatic reactions that convert macromolecules into absorbable units.

Question 2

A patient presents with inflammation of the pancreas (pancreatitis). Which of the following is a likely consequence of this condition?

Accepted Answer

Impaired digestion of proteins, carbohydrates, and fats due to reduced pancreatic enzyme secretion.

Question 3

Which equation best represents the concept of mass balance in physiology?

Accepted Answer

$$Input = Output + Accumulation$$

Question 4

What is the primary function of bile salts released from the liver into the small intestine?

Accepted Answer

To emulsify fats, increasing their surface area for enzymatic digestion.

Question 5

Which of the following best explains why the small intestine is highly effective at nutrient absorption?

Accepted Answer

It contains villi and microvilli that greatly increase the surface area for absorption.

Question 6

A bolus of food differs from chyme in which of the following ways?

Accepted Answer

A bolus is a mass of chewed food ready to be swallowed, while chyme is the semi-liquid mixture of food and gastric secretions found in the stomach.

Question 7

Which of the following is a correct causal explanation for how peristalsis moves food through the esophagus?

Accepted Answer

Peristalsis involves alternating contraction and relaxation of circular and longitudinal smooth muscle, propelling the bolus forward.

Question 8

Which of the following is an essential function of the stomach for nutrient absorption?

Accepted Answer

Secretion of intrinsic factor, which is necessary for vitamin B12 absorption.

Question 9

A patient with non-alcoholic fatty liver disease (NAFLD) is at risk for which of the following complications if the condition progresses?

Accepted Answer

Development of cirrhosis due to chronic inflammation and scarring.

Question 10

Which of the following best describes the role of pancreatic enzymes in digestion?

Accepted Answer

Pancreatic enzymes chemically break down proteins, carbohydrates, and fats into absorbable units.

Question 11

Which of the following is a real-world example of how societal impacts of biological research can affect health equity?

Accepted Answer

Research on liver cancer disparities leads to targeted interventions that improve outcomes for underrepresented populations.

Question 12

Which of the following is a correct application of Le Chatelier's Principle in human physiology?

Accepted Answer

If the concentration of a substrate increases in a reversible reaction, the system will shift to consume more substrate and produce more product.

Question 13

Which of the following is NOT a function of the liver in digestion?

Accepted Answer

Secretion of proteases for protein digestion.

Question 14

Which of the following best explains why a sedentary lifestyle increases the risk of non-alcoholic fatty liver disease (NAFLD)?

Accepted Answer

It contributes to metabolic syndrome, which promotes fat accumulation in the liver.

Question 15

Which of the following is a correct multi-step explanation for how the pancreas, liver, and gallbladder work together to aid digestion in the small intestine?

Accepted Answer

The liver produces bile, which is stored in the gallbladder and released into the small intestine to emulsify fats; the pancreas secretes enzymes that chemically digest proteins, carbohydrates, and fats.

Question 16

Which of the following best describes the process of absorption in the digestive system?

Accepted Answer

Movement of nutrients from the digestive tract lumen into the blood.

Question 17

Which of the following is a plausible effect of impaired secretion of intrinsic factor in the stomach?

Accepted Answer

Decreased absorption of vitamin B12, leading to anemia.

Question 18

Which of the following is a correct example of a homeostatic control system in physiology?

Accepted Answer

Regulation of blood glucose levels by insulin and glucagon.

Question 19

Which of the following best describes the process of secretion in the digestive system?

Accepted Answer

Release of substances such as enzymes, acids, and bile into the digestive tract to aid digestion.

Digestive System Physiology: Study Guide and Exam Preparation

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