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HumanDigestive SystemMs. Reshma Parveen
2. Name and give the functions of the different digestive organs.3. Describe how some accessory organs and glands aid the body in the digestion process.4. Explain the process of digestion.1. Give and explain the functions of the digestive system.
1. Ingestion : process of eating2. Propulsion : passing of food down the GI tract• swallowing : voluntary• peristalsis : reflex, involuntary, involves alternatingcontractions of muscles in body walls of GI organs3. Mechanical digestion• prepares food for chemical digestion• includes chewing, mixing with saliva by tongue action,churning in stomach...4. Chemical digestion• catabolic steps in which food is broken down to basicbuilding blocks• accomplished by enzymes in digestive juices5. Absorption : passage of food particles into the blood-lymph6. Defecation : elimination of indigestible food substancesProcessing of food by the Digestive System involves 6 basic
Parts of Human Digestive SystemMain Parts•Mouth•Esophagus•Stomach•Small Intestine•Large IntestineAccessory Parts•Liver •Pancreas•Gallbladder•Salivary Gland
Main Parts of Digestive System
MouthThere two major processes which take place:•Mastication (Chewing):- Breaks down large food molecules.- Increases surface areaof food particles.•Secretion of Saliva:- Contains salivary amylase (ptyalin)that digests starch to maltose.