Purpose Of The Gut Flashcards
What is the point of sphincters in the gut
To separate the gut into different sections in order to have different functions
What digestion occurs in the mouth
Mechanical - teeth
Chemical - salvia
What is the function of the stomach
Mechanical digestion, chemical digestion and food storage
How is the stomach able to store food
The upper part of the stomach has thinner walls, allowing for receptive relaxation so the stomach can expand to hold food
How does mechanical digestion occur in the stomach
The lower stomach has 3 layers of muscle which contract to digest food
What are folds of rugae
Folds in the stomach which allow it to expand and store food
What is found in salvia for chemical digestion
Amylase, lipase
What chemicals are found in the stomach for chemical digestion
HCl, pepsin
What is found in the small intestine for chemical digestion
Bile, pancreatic fluid
What are the defence mechanisms against pathogens in the gut
IgA, HCl, lymphoid tissue, kupffer cells
What cells secrete intrinsic factor
Parietal cells in the stomach
What does intrinsic factor do
Allows absorption of vitamin B12
What happens in the duodenum
Neutralisation of chyme, and digestion with bile and pancreatic fluid
What happens in the jejunum
Nutrient absorption, final digestion
What happens in the ilium
Water absorption, B12 absorption, bile acid reabsorption
