Physiology 2130 Lecture Notes - Centroacinar Cell, Enterochromaffin-Like Cell, Pancreatic Lipase Family
21 May 2013
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Document Summary
Absorption occurs in the small intestine and large intestine. Secretion occurs in the mouth, stomach, small intestine, and large intestine. Saliva (almost pure water) lubricates food for travel through the digestive tract and also plays a small role in digestion (breakdown of carbohydrates by amylase) Three main salivary glands submandibular, sublingual, and parotid. Primary functional unit of salivary glands is the salivon (diagram on page 552) Saliva in its initial form (secreted by acinar cells) is isotonic (same osmolarity as plasma) As saliva moves from the acinus through the striated duct, na+ ions are reabsorbed (taken out of. ), which help neutralize acidic foods the saliva) and k+ ions are secreted (added to the saliva) by an active transport mechanism. More na+ is removed than k+ added, meaning that saliva moving through the striated duct becomes more and more hypotonic (lower osmolarity than plasma)
