Lesson 6 - Digestion And Dufestive System Flashcards
What are the five stages of digestion
Ingestion
Digestion
Absorption
Assimilation
Egestion
What is mechanical digestion
Happens primarily in the mouth
Increases surface area
Also happens in stomach
What is chemical digestion
Starts in mouth
Continues in the stomach and small intestine
It involves breaking the chemical bonds in the large molecules resulting in the formation of smaller molecules
What are enzymes responsible for
Chemical digestion
What are the 3 main enzymes
Amylase
Protease
Lipase
What does amylase do
Breaks down carbs
What does protease do
Breaks down protein
What does lipase do
Breaks down fats
What happens in the mouth
Food is chewed
Teeth cut up food into smaller pieces
This increases surface area
Saliva is also added
This contains amylase to digest starch
What is the oesophagus
Tube that carries food from mouth to stomach
What does the oesophagus have
Muscular walls
What happens in the stomach
Mechanical and chemical digestion
What do the walls of the stomach produce
Hydraulic acid
What does this ensure
Any bacteria on our food is killed off
What are features the small intestine have that increase fee surface area
- it’s very long
- walls are folded
- walls are covered in villi
