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USMLE Exam Prep

Category - Free USMLE Practice Test Questions

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The first part of the digestive process is known as the ________ phase and starts with the sight, smell or taste of food.

Neurogenic
Vagal
Gastric
Both A and B

Explanation

Answer - D - The first part of the digestive process is known as the neurogenic phase, or the vagal phase. The sight, smell, or taste of food stimulates the brain’s vagal nuclei, which cause pepsinogen, HCl, and gastrin to be produced.

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