B3 Flashcards
What is a tissue
A group of cells with a similar structure and function
Give 2 examples of tissues
Muscular
Glandular
What does the digestive system include
Glands
Stomach
Liver
Small intestine
Large intestine
What are villi
Absorb soluble food efficiently in the small intestine
What are the 3 components of food
Carbohydrates
Lipids
Proteins
What are all carbohydrates made of
Units of sugar
Give an example of a complex carb
Starch
What are lipids
Three molecules of fatty acids linked to a glycerol molecule
What are proteins made of
Long chains of amino acids
What type of catalysts are enzymes
Biological catalysts
What is a substrate
A substance in which an enzyme can act
Give 2 factors affecting enzyme action
Temperature
pH
What happens if the temperature is too high
Enzyme becomes denatured
What does denatured mean
Active site changes shape
What pH do enzymes in the stomach work best at
Acidic
How does pH affect enzymes
A change in pH affects forces which hold the enzyme together which changes the shape of it
Where are digestive cells produced
Glands and small intestine
What food does amylase break down
Carbs
Where is amylase produced
Salivary glands
Pancreas
Small intestine
What does protease break down
Proteins
Where is protease produced
Stomach
Pancreas
Small intestine
What does lipase break down
Lipids into glycerol
What is bile
Released by liver to neutralise food leaving stomach and emulsify fat
What are the 3 tissues found In the stomach
Muscular
Glandular
Epithelial
What is epithelial tissue used for
Line inside and outside of stomach
