Multiple Choice
Which of the following is not an accessory digestive organ?
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23. The Digestive System
Introduction to the Digestive System
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Which of the following might stimulate the cephalic phase of gastric secretion?
A
The absorption of nutrients in the small intestine
B
The presence of food in the stomach
C
The release of bile from the gallbladder
D
The sight and smell of food
Verified step by step guidance1
Understand the cephalic phase of gastric secretion: This phase is the earliest stage of digestion, triggered by the sight, smell, taste, or thought of food, even before food enters the stomach.
Identify the stimuli associated with the cephalic phase: The cephalic phase is primarily stimulated by sensory inputs such as sight and smell, which activate neural pathways leading to gastric secretion.
Evaluate each option: Consider how each option relates to the cephalic phase. The absorption of nutrients in the small intestine and the presence of food in the stomach are not initial sensory triggers; they occur later in the digestive process.
Consider the role of bile: The release of bile from the gallbladder is related to fat digestion and occurs in the intestinal phase, not the cephalic phase.
Conclude with the correct stimulus: The sight and smell of food are direct sensory inputs that stimulate the cephalic phase, aligning with the definition and function of this phase in digestion.
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