Stages in the Digestive Process

Stages in the Digestive Process - particles/molecules small...

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Stages in the Digestive Process Food for the most part consists of various organic macromolecules such as starch, proteins, and fats. These molecules are polymers made of individual monomer units (as discussed in an earlier chapter). Breaking these large molecules into smaller components involves: 1. movement: propels food through the digestive system 2. secretion : release of digestive juices in response to a specific stimulus 3. digestion : breakdown of food into molecular components small enough to cross the plasma membrane 4. absorption : passage of the molecules into the body's interior and their passage throughout the body 5. elimination: removal of undigested food and wastes Three processes occur during what we loosely refer to as "digestion". Digestion proper, which is the mechanical and chemical breakdown of food into
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Unformatted text preview: particles/molecules small enough to pass into the blood. Absorption is the passage of food monomers into the blood stream. Assimilation is the passage of the food molecules into body cells. Components of the Digestive System The human digestive system, as shown in Figure 2, is a coiled, muscular tube (6-9 meters long when fully extended) stretching from the mouth to the anus. Several specialized compartments occur along this length: mouth, pharynx, esophagus, stomach, small intestine, large intestine, and anus. Accessory digestive organs are connected to the main system by a series of ducts: salivary glands, parts of the pancreas, and the liver and gall bladder ( bilary system )....
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