digestive process?I am looking for a description of the digestive process for a baked potato, starting from the mouth and ending with the liver. where does digestion occur, what enzymes are involved & how is the potato broken down?
Posted by pandasex
http://en.wikipedia.org/wiki/Digestion
with pics
enzyme is called
[edit] Phases of human digestion
Cephalic phase - This phase occurs before food enters the stomach and involves preparation of the body for eating and digestion. Sight and thought stimulate the cerebral cortex. Taste and smell stimulus is sent to the hypothalamus and medulla oblongata. After this it is routed through the vagus nerve.
Gastric phase - This phase takes 3 to 4 hours. It is stimulated by distention of the stomach and alkaline pH. Distention activates long and myentric reflexes. This activates the release of acetylcholine which stimulates the release of more gastric juices. As protein enters the stomach, it binds to hydrogen ions, which raises the pH of the stomach to an alkaline level. This triggers G cells to release gastrin. Gastrin activated HCl secreting parietal cells. HCl release is triggered by 3 chemicals - acetylcholine, gastrin and histamine.
Intestinal phase - This phase has 2 parts, the excitatory and the inhibitory. Partially-digested food fills the duodenum. This triggers intestinal gastrin to be released. Enterogastric reflex inhibits vagal nuclei, activating sympathetic fibers causing the pyloric sphincter to tighten to prevent more food from entering, and inhibits local reflexes.
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