Tracing the passage of food through the digestive system, which of the following is correct?
Mouth, pharynx, large intestine, small intestine
Mouth, esophagus, stomach, pharynx, small intestine
Mouth, pharynx, esophagus, stomach, small intestine
Mouth, pharynx, stomach, esophagus, anus
The Correct Answer is C
A. Mouth, pharynx, large intestine, small intestine: The small intestine comes before the large intestine in the digestive tract.
B. Mouth, esophagus, stomach, pharynx, small intestine: The pharynx comes before the esophagus, not after.
C. Mouth, pharynx, esophagus, stomach, small intestine: This is the correct order of food movement through the upper GI tract.
D. Mouth, pharynx, stomach, esophagus, anus: The esophagus precedes the stomach, and the anus is the final structure after the large intestine.
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Related Questions
Correct Answer is B
Explanation
A. Stores undigested pieces of food: The stomach, not the esophagus, is responsible for storing food temporarily.
B. Transports food from the pharynx to the stomach: The esophagus is a muscular tube that uses peristalsis to move food from the pharynx to the stomach.
C. Absorbs nutrients: Nutrient absorption occurs mainly in the small intestine, not the esophagus.
D. Breaks down proteins: Protein digestion begins in the stomach via pepsin, not in the esophagus.
Correct Answer is C
Explanation
A. Large intestine, excretion: The large intestine mainly absorbs water and forms feces; it does not have villi.
B. Pancreas, release of hormones: The pancreas releases insulin and glucagon but has no villi and is not directly involved in nutrient absorption.
C. Small intestine, absorption: Villi are fingerlike projections that line the small intestine to increase surface area for absorption of nutrients.
D. Gallbladder, production of bile: The liver produces bile; the gallbladder only stores it. Villi are not involved.
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