Topic 3: Digestion And Absorption Flashcards
What kind of reactions are involved in digestion?
Hydrolysis
What does physical breakdown mean in terms of digestion?
Food is broken down from larger to smaller pieces by teeth
This creates a large surface area for chemical digestion
What 2 parts of the body help with physical breakdown?
Teeth
Stomach-muscle wall churns food to break it up
What is chemical digestion?
The breakdown of large,insoluble molecules, into smaller soluble ones
They are hydrolysed by enzymes
What are the 3 types of digestive enzymes?
Carbohydrates
Lipases
Proteases
What do carbohydrates hydrolyse?
Carbohydrates to form monosaccharides
What do lipases hydrolyse?
Lipids to form fatty acids + glycerol
What do proteases hydrolyse?
Proteins to form amino acids
How are hydrolysed molecules from digestion absorbed?
Various mechanisms from the small intestine into the blood
What is assimilation?
The incorporation of molecules absorbed in the small intestine into body tissues or the use of them in processes
Name the 5 enzymes involved in the digestion of starch
Salivary amylase
Pancreatic amylase
Maltese
Sucrase
Lactase
When is starch first hydrolysed in digestion?
