Final answer:
The cephalic phase of gastric secretion can be totally eliminated by a vagotomy (surgical removal of the parasympathetic innervation of the stomach).
Step-by-step explanation:
The cephalic phase of gastric secretion refers to the initial phase of gastric secretion that occurs before food enters the stomach. It is triggered by the smell, taste, sight, or thought of food, which stimulates parasympathetic neurons to release acetylcholine. Acetylcholine then increases gastric secretion to prepare the stomach for digestion.
This reflex phase can be totally eliminated by a vagotomy, which is the surgical removal of the parasympathetic innervation of the stomach. By removing the parasympathetic nerves, the stimulation of acetylcholine release is prevented, effectively eliminating the cephalic phase of gastric secretion.