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Year 8 Biology
Lucy Kendall
Created on May 14, 2023
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Year 8 Biology
This will cover topics from all biology in year 8 ( :
START
Index
5. small intestine
1. Diet
9. muscles
6. aerobic respiration
2. foodtests
10.sketeton
3. digestive system
7. anerobic resperation
11. Dna
12.diseases
4. enzymes
8ventilation
DIET
- A diet means what you eat and drink.
- A balenced diet is where all food is eaten in the right amounts
- Essential food groups:
- Protein
- Carbohydrates
- Minerals
- Fats and Lipids
- Fibre
- Vitiamins
- Water
FOOD TESTS
Sugar- Benidicts reagant(+heat)-turns red
Starch- iodine reagant- turns black if starch present
Protien- Biuret regant- turns purple if protien present
Lipids- Filter Paper- becomes translucent if lipids present
digestive system
ENZYMES
SMALL INTESTINE
Inside the small intestine, digestion is completed and the small soluble food molecules are absorbed into the blood.
The small intesine has:
it has a dense blood supply so that nutrients can easily be absorbed into the blood
A large surface area created by villi
It is extremly long, it stretches out to be 7 meters
respiration (areobic)
where does respiration occur?
Glucose + Oxygen
Carbon dioxide + water (+ energy)
Respiration takes place inside mitochondria in all cells
Anerobic resperation
Glucose
Lactic acid (+ less energy)
Anerobic resperation occurs when the cells do not have enough oxygen to respire areobically, this usally happens during exercise.
ventilation
+ Info
Muscles
SKELETON
DNA
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What does it look like?
What is it??
DNA is made up of 2 strands joined together by the bases( A,T,G,C) and twisted to form a double helix
Dna stands for deoxribonucleaicacid, DNA codes the charcteristics for a cell
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THANKS!