Chain of Events (Nervous System)
Thinking of food (ie smell, sight) – Stimulates cerebral cortex – Sends messages to hypothalamus – to the medulla oblongata – to parasympatheic nervous system by the vagus nerve – to stomach (Gastric Glands in walls of fundus and body of stomach) – to secrete gastric juice. (nervous system and hormone system)
a. Food enters stomach – stomach stretches and activates stretch Receptors – sends message to the medulla oblongata (vagus Nerve) and then back – to stomach by the vagus nerve — Result: parietal cell secrete gastric juice.
b. Chemical Stimuli (ie. partially digested proteins, caffeine) – directly activates – G cells (Enteroendocrine Cells) located in the pyloric region of the stomach – to secrete gastrin – Gastrin stimulates – Gastric Glands to secrete gastric Juice.
Read more about this topic: Cephalic Phase
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