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10 Cards in this Set
- Front
- Back
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secretion via serous acini vs mucous acini
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salivatory secretion via serous acini (↑ H2O) controlled by parasympathetic stimulation (salivatory nucleus of medulla) while secretion via mucous acini (↓ H2O) controlled by sympathetic stimulation.
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Parotid Submandibular, Sublingual glands secrete ___? via?
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secrete saliva [α-amylase (starch breakdown), lysozyme (bacteriocide), mucin (dehydrated mucous)] via serous acini and mucous acini
NOTE PAROTID GLANDS ONLY HAVE SEROUS ACINI |
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Myoepithelial cells
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line acini and contract to expel saliva quicker
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Myenteric Plexus (Auerbach’s Plexus)
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Between longitudinal and circular tunica muscularis controlling digestive tract motility.
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Submucous Plexus (Meissner’s Plexus)
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Buried in submucosa, functioning to sense luminal environment (regulate blood flow, osmolarity, epithelial cell function).
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ductal cells
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as saliva passes through the ducts, it gains bicarbonate and P/Ca2+
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Surface Mucous Cells
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-Secrete mucous, bicarbonate and trefoil peptides (stabilize mucous/bicarbonate layer) to protect stomach wall from autodigestion.
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Parietal Cells
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Secrete HCl
-Secrete Intrinsic Factor -Contain acidic tubulovesicles in which proton pumps are localized; these fuse to canaliculi to position pumps for H+ secretion into the stomach when triggered by histamine, gastrin, or ACh (from vagus nerve). |
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Intrinsic Factor
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secreted by Parietal Cells. Binds B12 for absorption in the distal ileum
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Chief Cells
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Secrete Pepsinogen (HCl activated, denatures proteins) and gastric lipase (begin fat breakdown).
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