Mucus (thick & alkaline) - forms a protective coating for the stomach lining, Mucus (thin & watery) - mixes with food and creates a medium for chemical reaction., Acid Hydrochloric - kills bacteria, provide acidic environment for the action of enzymes in stomach, Intrinsic factor - aids in the absorption of vitamin B12, Pepsinogen - inactive form of enzyme pepsin, Gastrin - a hormone that regulates gastric activity, Mucous cells - produces mucus, Parietal cells - secrete acid hydrochloric (HCL) & intrinsic factor, Chief cells - secrete pepsinogen, Endocrine cells - secrete hormone gastrin,

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