biology year 8

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What is the difference between breathing and respiration?
Breating is an exchange of gases. Respiration is a reaction in the cells to release energy.
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What is the word equation for respiration?
glucose + oxygen --) carbon dioxide + water + energy
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What part of air do we take in to our body and why?
Oxygen because it is needed for respiration in cells.
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What do we breath out that ir a waste product from respiration?
Carbon dioxide, dissolved in plasma in blood
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Where does carbon dioxide come from?
Respiration in cells, waste product
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What carries oxygen in blood?
haemoglobin in red blood cells
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What do white blood cells do in our body?
They fight disease and produce antibodies.
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What vessles carry blood away from the heart?
Arteries
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What vessels carry blood back to our heart?
veins
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What is the name of the vesselthat has thin walls, which helps food, oxygen and waste pass through to neighbouring cells?
Capillaries
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What are the 7 nutrients required for a balanced diet?
Carbohydrates, fat, protein, vitamins, minerals, fibre and water
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Where does digestion start in our bodies?
In our mouth (mechanical digestion)
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Why do we chew our food?
To mix it with saliva to make it easier to swallow and to make it into smaller bits to ease digestion.
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What breaks down food molecules in our alimentary canal?
Enzymes
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Why do foods need to be broken down in our alimentary canal?
So that they are soluble and small enough to dissolve into the blood stream.
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Why is it dangerous to eat too much saturated fat in our diet?
It can lead to fats blocking our blood vessels which can cause heart attacks.
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What are the three harmful substances in smoking?
Nicotine, carbon monoxide and tar
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what are the three diseaces that smoking can cause?
lung cancer, bronchitis, emphysema
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What do carbs give us?
glucose - needed for energy
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What does protein give us?
Amino acids - need for groth, repair of cells
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what do fats give us?
fatty acids and glycerol - energy and insulation of cells
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What does lack of vitamins cause?
Scurvy
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What do our kidneys do in our body?
Remove waste chemicals from the blood, urea
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Why is the small intestine so good at absorbing food?
it is long and has a long surface area, thin lining and good blood supply.
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What is meant by egestion?
getting rid of waste products from digestion
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what is meant by environmental variation?
variation in organisms that is affectd by how things live, eat, schooling e.g weight.
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What is a chromosone?
inside a nucleus there are pairs of threadlike chromosones (23 pairs in humans)
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what do chromosones do?
carry genes which determine our characteristics
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how many chromosones do humas have?
23 pairs, 46
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What is a gene?
23 singe chromosones, so that when fertiliseation occurs, the new cell has a complete set.
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Whwere do you find chromosones?
inside the nucleus of each cell.
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Name one bacterial disease and one caused by a virus.
bacteria- salmonella, tuberculosis. virus - chicken pox, flu, aids ,measels
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Other cards in this set

Card 2

Front

What is the word equation for respiration?

Back

glucose + oxygen --) carbon dioxide + water + energy

Card 3

Front

What part of air do we take in to our body and why?

Back

Preview of the front of card 3

Card 4

Front

What do we breath out that ir a waste product from respiration?

Back

Preview of the front of card 4

Card 5

Front

Where does carbon dioxide come from?

Back

Preview of the front of card 5
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