9.4 Digestion in the Mouth and Stomach. Mouth Physical digestion-chewing.

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Presentation transcript:

9.4 Digestion in the Mouth and Stomach

Mouth Physical digestion-chewing

Mouth Chemical digestion Saliva -1 litre per day -makes food wet (mucous, enzymes) -Bolus ( a wet ball of food) -Enzyme: salivary amylase starch  disaccharides

Swallowing Tongue Soft palate protects nasal openings Epiglottis protects airways

Peristalsis Waves of smooth wave-like muscle contractions

Structure of the Stomach 2L capacity Site of protein digestion

Sphincters Circular muscle Relaxed, food can move through

Stomach Layers: mucosa innermost layer, mucosa secretes digestive juices replaced every 3 days

chyme food & gastric juice in the stomach

Gastrin Hormone released when food is present in the stomach 2L of gastric juices released each day

Acid hydrochloric acid, pH kills germs Activates enzymes (pepsinogen  pepsin) nerves in walls of stomach stimulate churning

Acid Reflux Improperly closed GI sphincter Medicine: tums, rolaids,

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