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Salivary Glands - bolus that is easily swallowed Chemical...

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Digestive System Salivary Glands * Submandibular Glands- * located in the floor of the mouth on the inside surface of the lower jaw * Duct empties into the mouth at a papilla on the side of the lingual frenulum, near the central incisors * Secretes mostly a serous fluid * Sublingual glands- * are the smallest of the salivary glands and is located on the floor of the mouth under the tongue. * Has several ducts that empty into the mouth posterior to the papilla of the submandibular duct * (secretes mostly mucous) Composition of Saliva * 99.5% water which provides medium for dissolving food so they can be tasted and for starting digestion reactions * .5% solute * amylase- the digestive enzyme from the parotid gland that acts on starch. * Mucous- lubricates food for easy swallowing * lysozyme- destroys bacteria to protect the mucous membranes and the teeth from decay. Digestion in the Mouth * Mastication (chewing)- the tearing, grinding and mixing of food with saliva to form a
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Unformatted text preview: bolus that is easily swallowed. * Chemical breakdown of starches begins in the mouth with the secretion of amylase from the parotid gland. The salivary amylase breaks the bonds between the polysaccharides, converting them to monosaccharides, that can then be absorbed through the walls of the GI tract. Pharynx * The tube that extends from the internal nares to the esophagus in back and the larynx in front. * It has both digestive and respiratory function. * It connects the nasal and oral cavities with the esophagus. * Has a deep layer of longitudinal oriented skeletal muscles * stylopharyngus m .- elevates the larynx & pulls it forward during swallowing * salpingopharyngus m .-raises nasopharynx * External circular layer that is divided into three layers called the superior , middle, and inferior pharyngeal constrictors * Forces food downward during swallowing...
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