iphy 3430 lecture 5

iphy 3430 lecture 5 - Digestive System Purpose: Obtain...

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Digestive System Purpose: Obtain energy-containing substrates, water, vitamins, and ions from outside body into circulation.
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Gastroesophageal sphincter Liver Stomach Gallbladder Pancreas Duodenum Descending colon Transverse colon Ascending colon Jejunum Cecum lleum Appendix Sigmoid colon Anus Rectum Table 16-1, pp. 582-583
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Mouth 1. Mastication 2. Moisten 3. Enzymatic breakdown Saliva 1. Ptyalin or α amylase 2. Mucus 3. Water 4. Thiocyanate, proteolytic enzymes, antibodies
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Formation of saliva 1. Serous solution containing ptyalin synthesized by all three glands (parotid only this kind). 2. Mucus secretion synthesized by both submandibular and sublingual glands. secretory granule.
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Mucus composed of glycoproteins (polysaccharides and protein) 1. Adherent qualities 2. Coats wall of gut, mouth, etc. 3. Allows particles to slide without resistance 4. Resistant to digestion 5. Can help buffer small amounts of acid
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Process of saliva secretion 1. Parasympathetic nervous system stimulation causes release of acetylcholine (ACH) on surface of salivary gland cells.
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This note was uploaded on 05/25/2008 for the course IPHY 3430 taught by Professor Lynch,robe during the Summer '08 term at Colorado.

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iphy 3430 lecture 5 - Digestive System Purpose: Obtain...

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