Digestive System Flashcards
Major organs of GIT
Mouth
Pharynx
Oesophagus
Stomach
SI
LI
Anus
Functions of digestion system
Ingestion
Mastication
Deglutition
Peristalsis
Absorption
Storage
Defecation
Define absorption
Entrance of ingested and secreted FLUIDS into EPITHELIAL CELLS, blood or lymph
Basic processes of digestive system
Motility
Secretion
Digestion
Absorption
Where are digestive juices secreted
Lumen of GIT
What secretes digestive juices
Exocrine glands
What contents are absorbed and taken where from and to
Water, vitamins, electrolytes
Transferred from GIT lumen to the blood or lymph
General principles of GI motility
Propulsive movements
Mixing movements
Mixing movements
Serve a twofold function
1. Mix food with digestive juices (promote digestion)
2.Facilitate absorption (expose parts of the intestinal contents to the absorbing surfaces of GIT
Define distention
Act of expanding by pressure from within: expansion: enlargement
What organs secrete hormones that help regulate the digestive system
Stomach
Small intestines
What hormone is produced by the stomach
Gastrin- stimulate gastric motility and the release of gastric acid
Hormone secreted by small intestines
Cholecystokinin
When do smooth muscles of the stomach and small intestines contract
Mechanical digestion
Nerve supply of GIT
ANS
Sympathetic and parasympathetic NS
Myenteric and submucosal plexus
