NFS284H1 Lecture 3: NFS284H1 – Chapter 3 – Digestion
Document Summary
Salivary glands: moistens food, salivary amylase used to break down starch components (made up of glucose components), that"s why it starts tasting sweet. Stomach: gastric acid helps break down the food. If you don"t have a gall bladder you may not be able to digest fat that well. Time it takes food to pass the length of the gi tract, typically 24 72 hours in a healthy adult. To measure transit time, an unabsorbed dye is added to a meal and the time it takes to appear in the feces is recorded. Fiber adds bulk to your feces and helps stimulate the muscles in your bowel to contract and push food along. Food components will travel the full length digestive tract to be eliminated in the feces (ex. Food components will enter the cells of the small intestine, where absorption takes place. Space inside of the tube of gi tract. The mucus secreted by cells of the di (digestive) tract:
