Basics of digestive system Flashcards
Main functions of digestive system
Digestion, Absorption, Secretion, Motility
Function of Mouth
Food is broken down by chewing, saliva added as lubricant
Function of oesophagus
conduit between mouth and stomach
Function of stomach
digestion of protein, food reduced to semi liquid form, storage an sterilisation. Both mechanical and chemical digestion takes place here.
Function of pancreas
Digestive enzymes for digestion of fats, carbs and proteins
function of liver
Bile salts for digestion/absorption of fats in small intestine and screens blood before it enters rest of body.
Function of gall bladder
Stores and concentrates bile
Function of small intestine
final stage of chemical digestion and nutrient absorption
Function of Large intestines
Water absorption, bacterial fermentation and formation of faeces
four layers of alimentary canal
Mucosa (epithelium, lamina propria, muscularis mucosae), Submucosa, Muscularis externa, Serosa/adventitia.
what is the peritoneum?
serous membrane forming the lining of the abdominal cavity
What does the muscularis externa contain
Circular muscle layer and longitudinal muscle layer
What effect happens when muscle layers contract
Circular: reduces diameter, Longitudinal: shortens length of tube.
What plexus is between submucosa and circular muscle layer
Submucosal plexus
Plexus between circular and longitudinal muscle layers
myenteric plexus
