BiologyII_DigestionandHormones.doc

BiologyII_DigestionandHormones.doc - B i o lo g y I I...

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Digestion Body Part Function in the Digestive System Enzymes/Chemicals Used to Digest Food Mouth Mechanically break down food for passafe through esophagus Salivary Amylase (startch) - secreted by salivary glands Esophagus Transport food from mouth to stomach via peristalsis. None Separated from stomach by esophageal sphincter (*loss of sphincter tone may lead to gastroesophageal reflux) Stomach Continue mechanical digestion, begin chemical digestion (starches into polysaccharides, proteins into peptides) Hydrochloric acid - maintains acid medium of stomach, activates pepsinogen to pepsin Separated from duodenum by pyloric sphincter Pepsinogen - pepsinogen converted to pepsin by HCl, breaks down protein to peptides Intrinsic factor - binds to B12 in the stomach Small Intestine Divided into duodenum, jejunum, ileum based on microscopic appearance and reabsorptive abilities. Enterokinase: activatese trypsinogen Continue chemical digestion (polysaccharides into single sugars, peptides into amino acids)
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This note was uploaded on 09/21/2011 for the course BIOLOGY PCAT taught by Professor Mcfadden during the Spring '11 term at Kaplan University.

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BiologyII_DigestionandHormones.doc - B i o lo g y I I...

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