Nutrition
what does the word diet mean?
In science diet is WHAT YOU EAT
What is the test for starch in food?
iodine solution
What does malnutrition mean?
Nutritional deficiencies
Where is food absorbed in the digestive system?
The small intestine
What is diffusion?
Movement of particles from a high concentration to a low concentartion
What do we need protein for?
Growth and repair.
What colour does food turn if starch is present?
Iodine is orange. It turns black if starch is present.
what causes rickets?
Vitamin D deficiency
What adaptations does the small intestine have.
lined with thousands of villi and microvilli thatincrease the surface area to absorb more nutrients
what is osmosis?
Movement of water molecules from an area of high concentration of water to an area of low concentration of water
What is fibre in our diet?
indigestible plant cells. Helps with defaecation.
What is the test for sugar in food?
Benedicts solution.
name a disease caused by lack of vitamin C
Scurvy
What pH is the stomach? Why?
pH 1.5/2; contains hydrochloric acid
What is active transport.
Active transport requires energy. It is the movement of particles from an area of low concentration to an area of high concentration.
Name 5 nutrients found in food.
Carbohydrate, fat, protein, vitamins and minerals.
What is the test for protein in food?
Biuret solution
What is the cause of anaemia?
Iron deficiency
What name is given to the removal of waste by defaecation?
Egestion
Name 3 ways substances can move in and out of cells.
diffusion, osmosis and active transport.
Name the two different forms of carbohydrate.
Starch (insoluble, complex) and sugar (soluble, simple)
What colour will you see if food being tested contains protein?
Biuret solution starts pale blue and turns purple if protein is present
Name a disease caused by a lack of protein.
Kwashiorkor
what is the role of bile?
bile emulsifies fats into smaller droplets to increase the surface area.
In order to diffuse does a substance have to pass through a partially permeable membrane?
No - think of air fresheners and perfume