Digestive System

• Digestive System - it is an organ system that breaks down and absorbs nutrients that the body can use as energy
• Mechanical Phase - refers to breaking down of food which starts from the mouth that involves pushing of food down to esophagus to be mixed with digestive juices.
• CHEMICAL PHASE - refers to further breakdown of food that can pass through the plasma membrane which requires the act of digestive enzymes within the mouth, stomach, pancreas and intestines.
• Esophagus - it transports chewed food (bolus) and liquid from mouth to stomach that is made by wave-like contraction (peristalsis)
• Amylase - digests starch to maltose
• Trypsin - digests proteins to peptides
• Lipase - digests fats to glycerol and fatty acids.
• Gallbladder - it acts as storehouse for bile
• food is taken into the mouth, a process called ingestion
• ingested food is broken down into smaller components in a process called digestion
• carbohydrates, fats, proteins, and nucleic acids are digested into their building blocks for easier absorption which is the third stage
• undigested materials make their way out of the digestive tract called elimination
• peristalsis - wave-like contraction
• Small Intestine: It has three (3) section: duodenum, jejunum, and ileum.