Lecture 19 - BIOL104-04 Principles of Biology I October 8...

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BIOL104-04 Principles of Biology I October 8, 2010 Lecture #19 Ch 48 The Digestive System
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Overview of the digestive tract
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Tissues of the digestive tract
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Stimulation of saliva easier to swallow • Contains amylase – Breaks down starch into maltose • Absence of food – 0.5 mL/minute • Presence of food – Increase in saliva production
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Mechanics of swallowing
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Early stages of digestion • Esophagus – Muscular tube – Connects pharynx to stomach – Moves the bolus of food through muscle contraction – Upper 1/3 skeletal muscle – Lower 2/3 smooth muscle
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Peristalsis
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Stomach • Holding station for acidic breakdown of food • Highly convoluted • 3rd layer of smooth muscle for churning food • Gastric juice – Acidic secretion of the gastric glands
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Gastric glands • 3 kinds of secretory cells • Mucus-secreting – Mucus protects interior of stomach from being digested • Parietal cells – Secrete hydrochloric acid – Intrinsic factor - needed for Vitamin B
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 19 - BIOL104-04 Principles of Biology I October 8...

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