BIOSC-116 Lecture Notes - Lecture 18: Stomach, Hydrolysis, Palatine Uvula
26 Aug 2020
School
Department
Course
Professor
Document Summary
Digestion (a parasympathetic event: mastication = chewing. This requires the actions of the teeth, tongue and hard palate: salivation (see below, chemical digestion of starch by the enzyme salivary amylase. Salivary reflex this is a parasympathetic reflex which is stimulated by the sight, smell, thought or presence of food in the mouth. It causes the salivary glands to release saliva. Saliva contains the enzyme salivary amylase, which begins the chemical digestion of carbohydrates. Swallowing reflex (cranial nerve ix) = deglutition. This reflex consists of a voluntary phase and an involuntary phase (the involuntary phase has 2 parts the pharyngeal phase and the esophageal phase: voluntary phase involves skeletal muscle. It occurs as you place the tip of the tongue against the hard palate and contract the tongue. This pushes the bolus of food into the oropharynx: pharyngeal phase occurs when the bolus is in the oropharynx and the oropharynx is moist.
