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The _____________ regulates the flow of contents from the stomach to the duodenum.

A.

fundus

B.

gastric rugae

C.

pyloric sphincter

D.

antrum

Answer and Explanation

The Correct Answer is C

A. Fundus is the upper part of the stomach, which does not regulate the flow of contents to the duodenum.

B. Gastric rugae are folds in the stomach lining that allow for expansion but do not regulate the flow of contents to the duodenum.

C. Pyloric sphincter controls the flow of partially digested food (chyme) from the stomach into the duodenum.

D. Antrum is the lower portion of the stomach that helps in mixing and grinding food but does not directly regulate its flow to the duodenum.


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Related Questions

Correct Answer is D

Explanation

A. It increases both Na+ and K+ secretion: Aldosterone increases sodium (Na+) reabsorption and potassium (K+) secretion, but it does not increase the secretion of both ions.

B. It causes the urine to be more diluted. Aldosterone causes the urine to be more concentrated by increasing sodium reabsorption and potassium secretion.

C. It reduces Na+ reabsorption and K+ secretion. Aldosterone actually increases sodium reabsorption and potassium secretion, not reduces them.

D. It increases Na+ reabsorption and K+ secretion. Aldosterone promotes sodium reabsorption in the kidneys and increases potassium secretion, leading to more concentrated urine.

Correct Answer is C

Explanation

A. Trypsin functions in the small intestine, where the environment is slightly alkaline. Therefore, this enzyme does not function at a low pH.

B. Pancreatic amylase also functions in the small intestine, where the pH is neutral to slightly alkaline.

C. Pepsin functions in the stomach, where the environment is highly acidic (pH 1.5 to 2). Pepsin is the correct answer because it works optimally at this low pH.

D. Salivary amylase functions in the mouth, where the pH is neutral or slightly alkaline.

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