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Transcript of Project 3.2.2
The act of chewing reduces steak into smaller pieces, which exposes more s digestive enzymes that are in saliva and the stomach. Alpha-amylase is the most predominant enzyme in saliva and starts the digestion of starchy carbohydrates.From the mouth, chewed steak travels down the esophagus and enters the stomach.
The main stomach enzyme is pepsinogen, Pepsin starts to reduce the protein in steak into smaller building blocks called amino acids and peptide fragments. However, if your stomach isn’t acidic enough less pepsin is converted and protein digestion is significantly reduced. Your stomach juices also contain some gastric lipase, which continues to metabolize the saturated fat in the steak.
When the partially digested steak enters the small intestine, your gallbladder releases bile to further break down fat, and your pancreas releases proteases to further reduce the amino acid chains. The small intestine, the amino acids, fatty acids, cholesterol, vitamins and minerals from the steak are absorbed. Many of the nutrients travel to your liver first and then out to the rest of your bloodstream. The left over, fiber and indigestible gristle, passes into the colon, losses more fluid and then passes out of the body as feces. The total time it takes for a steak to be digested and passed is between 24 and 72 hours.
Main function: digestion of food, absorption of nutrients
3 sections: Duodenum, jejunum & ileum
Duodenum- surrounds head of pancreas. Receives enzymes & bile; responsible for large part of digestion
Jejunum- mid part. Products of digestion=absorbed here (sugars, amino acids, fatty acids)
Ileum- absorbs remaining nutrients, vit. B12 & bile acid
Function- to absorb water from the indigestible food thus maintaining water balance, condense and solidify the feces, & transport feces to rectum.
Digestive System Anatomy
Digestive enzymes=secreted by pancreas
Enter small intestine via pancreatic duct
Trypsin and chymotrypsin (proteolytic enzymes) cleave proteins into smaller peptides
Large & Small Intestines
Emily, Selby, Michayla, Madison
Enzymes of the
pH: gradually increases from pH 6 in duodenum to about pH 7.4 in ileum
Maintained by intestines secreting base to act as buffer
The Digestion of Steak
3 sections of the large intestine: cecum, colon and rectum
Functions: while the cecum and colon digest food with certain bacteria, absorb nutrients, water and salts, the rectum hold the solid waste produced. It does so until its ready for expulsion through the anus.