What is the purpose of HCl secretions? What cells secrete HCl in the stomach? Explain how H+...

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Medical Sciences

What is the purpose of HCl secretions? What cells secrete HClin the stomach?
Explain how H+ is secreted into the stomach. Fig. 21.9. Ifbicarbonate (HCO3-) were not transported out of the cell, wouldthere be more or less H+ available to secrete?
List three hormones that are involved in the digestive processand describe what they do.
Which of the four basic processes occur in the small intestine?Why are the villi and microvilli important?
Which of the four basic processes occur in the largeintestine?

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Purpose of HCl secretionEssential for digestion of foodConverts ferric form of iron into ferrous form forabsorption in gutKills bacteria and other ingestedmicrobesActivates pepsinogen to pepsinProvides acidic environment for the action ofpepsinHCl is secreted by the oxyntic or parietal cells ofmucosal epithelium of stomach fundus and bodyMechanism of HCl secretionH secretion is possible in stomach due to presence ofnumerous HK ATPases in apical membrane of parietalcellsHK pump actively pumps H out of the cell intogastric lumenIn exchange for H K enters the cellAs this is an active transport energy is provided forthe process by hydrolysis of ATPIn See Answer

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