BIOL 221 Lecture Notes - Lecture 8: Lingual Lipase, Medulla Oblongata, Immunoglobulin A
4 Mar 2020
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Document Summary
Salivary proteins include mucin (mucus protein), antimicrobial proteins including lysozyme and immunoglobulin a, and a small amount of salivary lipase (this begins the digestion of lipids). Salivary amylase is also produced; it begins the digestion of starch. Salivatory nuclei (pons and medulla oblongata) stimulated by: Afferent impulses due to irritation within lower gi tract. Salivary nuclei (also known as salivatory nuclei) are located in the pons and medulla oblongata. They are stimulated by afferent impulses from chemoreceptors, which are excited most by acidic substances, and by baroreceptors that are by mechanical stimuli. Afferent impulses from the chemoreceptors in the oral cavity travel through the facial (cn vii) and glossopharyngeal (cn ix) nerves. Baroreceptors send afferent impulses through the trigeminal nerve (cn v). Impulses coming from the olfactory receptors in the nasal cavity also stimulate the salivatory nuclei. The salivatory nuclei also receive impulses from the stomach and small intestine when these become irritated.
