Biology3 8A Food and digestion Flashcards
Why do we need fibre in our diets?
To keep the digestive system healthy
Why do we need protein in our diets?
For growth and repair
Why do we need carbohydrates and sugar in our diets?
For energy
Why do we need to digest food?
To make food molecules small enough to be absorbed in to our blood stream
A deficiency in which nutrient group causes Kwashiorkor?
Protein
What is the role of the small intestine in digestion?
Food molecules are absorbed in to the blood stream
How do villi increase the absorption of food molecules in the small intestine?
They increase the surface area.
How do you test for starch?
Iodine turns from orange to blue / black
How do you test for protein?
Biurets solution turns from blue to purple
How do you test for sugar?
Benedicts solution turns from blue to orange/red
A deficiency in what causes scurvy?
Vitmain C deficiency disease
What units are used to measure energy in food?
kJ / Kilojoules
What is an enzyme?
A molecule that breaks down food molecules in to smaller ones
What is the role of the mouth in digestion?
Breaks down food in to smaller pieces.
Why is saliva important in digestion?
Saliva contains enzymes which break down large molecules into smaller molecules.
