Unit 7-lecture 2.pptx - Unit 7-The Digestive System Lecture...

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Unit 7-The Digestive System Lecture 2-Secretions of the Digestive System
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Pepsinogen is secreted by chief cells within gastric pits. It is converted to a protein digesting enzyme, pepsin by HCl Gastric lipase is a fat digesting enzyme secreted in small amounts by the chief cells Mucus is secreted by mucus neck cells. Functions to protect the epithelial cells lining the stomach and lubricate the chyme Digestive and Exocrine Secretions From the Stomach
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HCl is secreted by the parietal cells. It activates pepsinogen, provides an optimum pH (1.5-3.5) for pepsin and kill incoming pathogens. Intrinsic factor is secreted by parietal cells and is essential for the absorption of vitamin B 12. Digestive and Exocrine Secretions From the Stomach
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Hormone Function Gastrin Serotonin Histamine Somatostatin Hormone Secretions From the Stomach
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Mucosa & Gastric Glands 5
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Regulations of Gastric Secretions Occurs in three phases: the cephalic phase, the gastric phase and the intestinal phase
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Cephalic phase The cephalic phases is initiated by sensory
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