Layers of Alimentary Canal Submucosa Mucosa ircular muscle layer S eros Longitudinal muscle layer
6 Layers of Alimentary Canal Serosa Submucosa Mucosa Circular muscle layer Longitudinal muscle layer
Layers of Alimentary Canal Myenteric plexus Serosa Mucosa Submucosal plexus c Longitudinal Submucosa muscle Circular muscle
7 Serosa Mucosa Submucosa Longitudinal muscle Circular muscle Layers of Alimentary Canal Myenteric plexus Submucosal plexus
1. Digestion of food and absorption of nutrients are accomplished in a long tube connected to the r external world at both ends 2. Secretion and motility of the tube are major themes in understanding the gut
8 1.Digestion of food and absorption of nutrients are accomplished in a long tube connected to the external world at both ends 2.Secretion and motility of “the tube” are major themes in understanding the gut
Processing of food by the ds 1. Ingestion: process of eating 2. Propulsion: passing of food down the gi tract swallowing: voluntary peristalsis: reflex, involuntary, involves alternating contractions of muscles in body walls of Gi organs 3. Mechanical digestion prepares food for chemical digestion includes chewing, mixing with saliva by tongue action, churning in stomach
9 1. Ingestion : process of eating 2. Propulsion : passing of food down the GI tract • swallowing : voluntary • peristalsis : reflex, involuntary, involves alternating contractions of muscles in body walls of GI organs 3. Mechanical digestion • prepares food for chemical digestion • includes chewing, mixing with saliva by tongue action, churning in stomach... Processing of food by the DS
Processing of food by the DS 4. Chemical digestion catabolic steps in which food is broken down to basic building blocks accomplished by enzymes in digestive juices 5. Absorption: passage of food particles into the blood lymph 6. Defecation: elimination of indigestible food substances 10
10 4. Chemical digestion • catabolic steps in which food is broken down to basic building blocks • accomplished by enzymes in digestive juices 5. Absorption : passage of food particles into the bloodlymph 6. Defecation: elimination of indigestible food substances Processing of food by the DS