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BIO 169 THE DIGESTIVE SYSTEM QUESTIONS AND CORRECT ANSWERS

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BIO 169 THE DIGESTIVE SYSTEM QUESTIONS AND CORRECT ANSWERS

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Rugae


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folds in the stomach




Peristalsis


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The major means of propulsion, involves altering waves of contraction and
relaxation of muscles in the organ walls




Digestion

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Enzymes secreted into the lumen of the alimentary canal break down
complex food molecules to their chemical building blocks




Hard palate


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Underlain by the palatine bone and the palatine process of the maxillae
Forms a rigid surface against which the tongue forces food during chewing




Saliva


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*97-99.5% water
*slightly acidic (pH 6.75-7)
*protect against microorganisms by IgA, Lysozyme, Defensins




Three key concepts govern regulation of digestive activity


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*provoke by a range of mechanical and chemical stimuli
*effector of digestive activity are smooth muscle and glands
*neurons and hormones control digestive activity

, Parietal peritoneum


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lines the body wall




Visceral peritoneum


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Covers the external surfaces of most digestive organs




muscularis mucosae


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Scant layer of smooth muscle cells that produce local movements of the
mucosa that can enhance absorption and secretion




Lamina propria


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A loose areolar connective tissue

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