Question 1

Which of the following best describes the primary digestive function of the liver?

Accepted Answer

Production of bile, which acts as a fat emulsifier

Question 2

A patient presents with obstructive jaundice due to gallstones. Which structure is most likely blocked?

Accepted Answer

Bile duct

Question 3

Which cell type in the liver is primarily responsible for removing debris and old red blood cells from blood?

Accepted Answer

Stellate macrophages (Kupffer cells)

Question 4

What is the main function of bile salts in digestion?

Accepted Answer

Emulsification and absorption of fats

Question 5

Which equation best represents the neutralization of acidic chyme by pancreatic juice in the duodenum?

Accepted Answer

$$ \mathrm{HCl} + \mathrm{$$NaHCO_3$$} \rightarrow \mathrm{NaCl} + \mathrm{H_2CO_3} $$

Question 6

Which of the following enzymes is secreted in an inactive form to prevent self-digestion of pancreatic tissue?

Accepted Answer

Trypsinogen

Question 7

A patient with chronic hepatitis develops portal hypertension. Which pathological process is most likely responsible?

Accepted Answer

Fibrosis and fatty infiltration of the liver

Question 8

Which structure is responsible for absorbing most nutrients in the digestive tract?

Accepted Answer

Small intestine

Question 9

Which of the following is a correct sequence for the flow of bile from the liver to the duodenum?

Accepted Answer

Common hepatic duct → bile duct → duodenum

Question 10

Which of the following is a function of the bacterial flora in the large intestine?

Accepted Answer

Synthesis of vitamin K and B vitamins

Question 11

A marathon runner experiences diarrhea after a race. What is the most likely physiological explanation?

Accepted Answer

Insufficient time for water absorption due to jostling of digestive viscera

Question 12

Which hormone increases motility of the ileum and enhances the gastroileal reflex?

Accepted Answer

Gastrin

Question 13

Which structural modification of the small intestine increases surface area for absorption?

Accepted Answer

Villi

Question 14

Which of the following is the correct end product of protein digestion?

Accepted Answer

Amino acids

Question 15

Which process is initiated by the rise in motilin during the late intestinal phase?

Accepted Answer

Peristalsis (migrating motor complex)

Question 16

Which of the following best describes the role of the gallbladder?

Accepted Answer

Storage and concentration of bile

Question 17

Which equation represents the breakdown of triglycerides by pancreatic lipase?

Accepted Answer

$$ \mathrm{Triglyceride} + 3\,\mathrm{H_2O} \xrightarrow{	ext{lipase}} \mathrm{Glycerol} + 3\,\mathrm{Fatty\,Acids} $$

Question 18

Which of the following is a consequence of prolonged diarrhea?

Accepted Answer

Dehydration and electrolyte imbalance (acidosis and loss of potassium)

Question 19

Which cell type in the intestinal crypts secretes antimicrobial agents such as defensins and lysozyme?

Accepted Answer

Paneth cells

Question 20

Which of the following best explains why chemotherapy often causes nausea, vomiting, and diarrhea?

Accepted Answer

Chemotherapy targets rapidly dividing cells, including GI tract epithelium

Digestive System: Structure, Function, and Processes(part 2)

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