Digestion Flashcards
How does the lock and key theory work?
The substrate is catalysed, fits into active site of enzyme. They bind together. Then reaction will takr place and products are released
What can enzymes do?
Break up large molecules and join small ones together
Definition of enzyme?
Special biological catalysts that speed up reactions
Fill in gaps:
…………. chains of …………. …………… fold to produce a ……… …… ……………. with an ………….. ………..
Long
Amino Acids
Chain of Molecules
Active site
What is digestion?
Breakdown of large insoluble molecules inot smaller soluble moleculeswhich can pass through wall og gut into blood
What is mechanical digestion?
Food ground up by teet and churning movement
What is chemical digestion?
Large molecules being broken down into smaller ones by enzymes
First place of digestion. What happens and what’s produced?
Where ingestion takes place
Teeth mechanically digest food
Mixes with saliva, tongue pushes food
Saliva has an enzyme (Amalyse) which digests carbohydrates
Where does food go after mouth. What happens and what’s produced?
Goes to oesphagus
Swallowed and pushed down by peristalsis
Where does food go after Oesaphagus. What happens and what’s produced?
Goes to stomch
Digests protein by protease
Mixes with gastric juices
Breaks down protein mechanically
Where does food go after Stomch. What happens and what’s produced?
Goes to duodenem
Juice from pancreas contains carbohydrase, protease and lipase
Chemical digestion
Where does food go after Duodenem. What happens and what’s produced?
Pancreas produces digestive juices
Liver produces bile
Bile stored in Gall bladder
What does Bile do?
Neutralises acid creating alkaline conditions
Emulsifies fats- Speeds up digestion by lipase
After accesorie organs carry out function, what happens to food. What happens and what’s produced?
Goes to Ileum Walls make a juice containing carbohydrase, protease and lipase Completes digestion of fats -> fatty acids, carbohydrate -> sugars and proteins -> amino acids
Where does food go after Iluem. What happens and what’s produced?
Goes to Large intestine
Frst to colon where water is reabsorbed into the blood.
Food that cant be digested passes to rectum and passes out of anus
