Week 10 - Digestive System Flashcards
6 integrated processes of the digestive system
- Ingestion
- Mechanical digestion and propulsion
- Chemical digestion
- Secretion
- Absorption
Defecation
Define ingestion
when food enters oral cavity
Define mechanical digestion and propulsions
Crushing and shearing of food
Define chemical digestion
- Chemical breakdown of food into small organic fragments for absorption by digestive epithelium
Define secretion
Release of water, acids, enzymes, buffers and salts
Define absorption
Movement of organic molecules, electrolytes, vitamins, minerals and water
Define defecation
Elimination of waste from body
Define myenteric plexus
Network of parasympathetic ganglia, sensory neurons, interneurons, and sympathetic postganglionic fibers
Define segmentation
Cycles of contraction that churn and fragment the bolos, mixing contents with intestinal secretions
Functions of the oral cavity
Sensory analysis
Mechanical digestion
Lubrication
Limited chemical digestion
Functions of the tongue
Mechanical digestion Manipulation to assist chewing
Sensory analysis
Secretions of mucus
Define mastication
Chewing
3 regions of the pharynx (throat)
Naso, oro, laryngo: pharynx
Function of the esophagus
Conveys food and liquids to stomach
Define deglutition
Swallowing