What are some functions of the digestive system?
What is the function of the mouth?
Break down foodstuff by chewing, saliva acting as a lubricant
What is the function of the oesophagus?
Conduit between the mouth and stomach
What is the function of the stomach?
Digestion of proteins
Foodstuff reduced to liquid form
What is the function of the pancreas?
Digestive enzymes for digestion of fats, carbohydrates and proteins
What is the function of the liver?
Produce bile salts for digestion/absorption of fats in the small intestine
What is the function of the gallbladder?
Stores and concentrates bile
What is the function of the small intestine?
Final stages of chemical digestion and nutrient absorption
What is the function of the large intestine?
Bacterial fermentation and formation of faeces
In basic terms what is the alimentary canal?
Continuous hollow tube from the oesophagus to the rectum
How long is the alimentary canal?
About 8m long
What can be said about the structural formation of the alimentary canal throughout its length?
It is the same throughout its length with 4 distinct layers
What are the 4 distinct layers of the alimentary canal?
Where is stratified squamous epithelium found?
Where is simple columnar epithelium?
What is the functions of epithelium?
Separate lumen of alimentary canal from the body
Synthesis and secretion of digestive enzymes, hormones and mucus
Absorbs products of digestion
What are the layers of the mucosa?
What is lamina propria?
Loose connective tissue (glands, blood and lymph vessels)
What is muscularis mucosae?
Thin smooth muscle layer
What is submucosa?
Thick, irregular connective tissue to support mucosa
What does the submucosa contain?
What do neurons form in the submucosa?
Submucosal plexus (parasympathetic)
Is the submucosal plexus sympathetic or parasympathetic?
Where are submucosal glands found?
What makes up the muscularis externa?
Two concentric thick layers of smooth muscles (inner layer and outer layer)
What is the inner layer of the muscularis externa?
What is the outer layer of the muscularis externa?
What is the function of the circular muscle?
What is the function of the longitudinal muscle?
What is the function of the muscularis externa?
Produce motility for peristalsis and segmentation