Digestive System Notes. Mouth. Esophagus. Stomach. Small Intestine. Large Intestine. System have BFS…. IC. I nterconnectedness C hanges. The “ BFS ”. B ehavior = Role (role of each part) F unction = Purpose (purpose of the whole system) S tructure = Parts
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BF Behavior vs. Function
Behavior is specific
Function is general
Mouth / Teeth
Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion
Chemical Digestion is the breaking down of large complicated molecules into simpler ones by the use of enzymes
Red and yellow- products
Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up chemical digestion
passage of molecules into body's interior &passage throughout the body
REABSORBS WATER & SALTS
Mouth / Teeth
Photograph by SPL/Photo Researchers, Inc.
Cone-shaped tongue papillae, seen here in a colored scanning electron micrograph, contain nerve endings that receive and transmit touch sensations to the brain.
As we begin chewing, the tongue shapes food in a ball-shaped bolus for swallowing.
Photograph by Lennart Nilsson
Inside the mouth, shown magnified here, teeth, tongue, and saliva work together to physically and chemically break down food.
Humans produce up to 3 pints (1.4 liters) of saliva daily, and chemical enzymes in the saliva play a major role in disintegrating starchy foods.
Image source: http://www.umm.edu/imagepages/19595.htm
This colored scanning micrograph shows a cast of blood vessels from the external wall of the small intestine.
Measuring about 22 feet (6.7 meters) in length, the small intestine performs most of the major digestion and absorption of nutrients.
The walls of the small intestine are lined with millions of projections called villi, which absorb and transmit nutrients into the bloodstream.
Animation of Digestion
Peristalsis video clip
Image source: http://media.photobucket.com/image/peristalsis/hurricane78_album/peristalsis.gif?o=2
Elimination of Waste