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The primary function of which organ is to deliver chyme (food bolus) to the duodenum at the proper rate?

A.

Stomach

B.

Liver

C.

Colon

D.

Esophagus

Answer and Explanation

The Correct Answer is A

A. Stomach: The stomach regulates the release of chyme into the duodenum via the pyloric sphincter, controlling the rate of gastric emptying.

B. Liver: The liver produces bile, but does not handle chyme or food bolus movement.

C. Colon: The colon processes waste after absorption and doesn’t interact with chyme from the stomach.

D. Esophagus: The esophagus moves food from the mouth to the stomach but does not regulate chyme delivery to the small intestine.


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Related Questions

Correct Answer is B

Explanation

A. Stomach: The stomach primarily functions in mechanical digestion and protein breakdown, but most absorption does not occur here.

B. Duodenum/proximal jejunum: These regions of the small intestine are responsible for majority of digestion and nutrient absorption, including fats, carbohydrates, and proteins.

C. Ascending colon: This is part of the large intestine, mainly involved in water and electrolyte absorption, not digestion.

D. Transverse colon: Like the ascending colon, this structure primarily functions in water absorption and feces formation.

Correct Answer is A

Explanation

A. Colon: The sigmoid colon is the S-shaped terminal portion of the large intestine, connecting to the rectum.

B. Esophagus: The esophagus is part of the upper digestive tract, not the colon.

C. Small intestine: The sigmoid colon is not a part of the small intestine.

D. Stomach: The stomach is part of the upper GI tract and does not include the sigmoid colon.

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