Senior Bio Notes Pt 8.docx - a Digestive processes occurring in the large intestine little food breakdown propulsion absorption(mostly Na and Cl ions

Senior Bio Notes Pt 8.docx - a Digestive processes...

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a. Digestive processes occurring in the large intestine: little food breakdown; propulsion, absorption (mostly Na+ and Cl- ions and water), and defecation; a small amount of digestion of the residue by enteric bacteria yields vitamins B and K, along with foul smelling gas (esp. Hydrogen sulfide) b. Feces - the semisolid product delivered to the rectum consisting of undigested food residues, mucus, sloughed-off epithelial cells, millions of bacteria, and enough water to allow smooth passage (hopefully). c. Defecation - a reflex action mediated by the spinal cord that causes the wall of the sigmoid colon and rectum to contract and the anal sphincters to relax. 2. Metabolism = food utilization a. Definition: sum of all chemical processes that take place in the utilization of food molecules b. Two major processes of metabolism: i. Catabolism - decomposition process that breaks food into smaller molecules; releases energy from food as heat or as chemical energy which is useful if first
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