Biology - Food and Digestion
- Created by: MaxR1
- Created on: 21-02-16 13:33
Food and Digestion introduction
Blanced Diet - The correct amount of all the nutrients and having the necessary energy requirements
Carbohydrate - Found in Bread, potato and cereal (sugar and starch are also carbs) - Needed for energy
Protein - Found in meat, fish and eggs - Needed for Growth and Repair
Fat - Found in for Cream, butter, milk and oil - Needed for a store of energy
Vitamins - Found in Vegetables and cereal - Needed to keep things 'ticking over' (Vit D means Healthy bones - Vit A means good eyesight)
Minerals - Found in Meat, milk and cereal - Needed for strong bones (Calcium keeps bones strong - Iron keeps blood good)
Fibre - Found in Fruit, Veg and cereal - Needed to keep you regular
Water - Found in Water and most foods - Needed for hydration
Food Tests
Iodine
- Drop some iodine onto the food. If the iodine turns blue/black then starch is present
Simple Sugars (e.g. Glucose)
- Boil the food in Benedict's solution. If an orange precipitate appears then the food contains simple sugars
Protein
- Add 10 drops of Biuret solution to the food in a test tube. If protein is present$, it will produce a purple product
Vitamin C
- Crush up food, add a few drops of water and stir
- Take the solution and add it to a DCPIP Solution
- Keep adding until the DCPIP is decolourised.
Food Tests Continued
Fats
- Shake or crush the food to make it dissolve.
- Filter or dilute the food and ethanol mix so that you get a clear liquid (a solution of fat in ethanol).
- Add this to a test tube of water. A white (milk-like) emulsion indicates the presence of fats or oils.
Metabolic Rate
Metabolic Rate - The speed at which such chemical reactions take place in the body.
It varies because of several factors, including:
- Age
- Gender - male or female
- The proportion of muscle to fat in the body
- The amount of exercise and other physical activity
- Genetic traits
The metabolic rate increases as we exercise and stays high for a while afterwards.
Teeth - Diet 1
Herbivore - Animals that only eat plants
- Butterflies
- Rabbits
- Hippos
Carnivore -Animals that only eat flesh (meateaters)
- Tigers
- Lions
- Bears
Insectivore- Animals that only eat insects
- Anteater
- Spider
- Lizard
Teeth - Diet 2
Omnivore - Animals that eat flesh and plants
- Pigs
- Badgers
- Mice
Teeth - Definitions
Incisors -
Cutting teeth used for pieces of food
Canines -
These are long and sharp teeth used to tear and hold food
Premolars -
These are used to crush and grind soft food
Molars -
Used for chewing and grinding hard food
Tooth Diagram
Tooth Amounts
Teeth Milk Adult
Incisors 8 8
Canines 4 4
Premolars 4 8
Molars 4 12
TOTAL 20 32
Gut Diagram
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