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Biology B1 Notes
B1a

CO-ORDINATION AND CONTROL

The nervous system enables you to react to your surroundings and co-ordinate
your behaviour.
The nervous system carries electrical signals (impulses) which travel fast.




Any changes (stimuli) are picked up by receptors.
The information (electrical signals) passes along the neurones.
The information reaches…

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Oral contraceptives contain Oestrogen, which stop the production of FSH, so
that the eggs mature.
Fertility drugs contain FSH, to make the egg mature.
When your fallopian tubes are damaged, the eggs can't reach the womb, so the
eggs are removed and fertilised outside the body. Then the developing embryos…

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A drug is a substance which alters the way in which your body works. It can
affect your mind, body or both.
Some drugs make you addicted to them. When addicts try to stop using drugs,
they get WITHDRAWAL SYMPTOMS like aches, pains, sweating, shaking,
headaches and cravings for the…

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If you cut your skin, platelets form a clot which dries into a scab. The scab
prevents pathogens from entering.
White blood cells ingest (eat) pathogens, produce antibodies (these target
particular virus or bacteria and destroy them) and produce antitoxins (they can
counteract the toxins released by pathogens ­ neutralise)…

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Plants use the wind or mini-explosions to spread their seeds.

VARIATION

Inherited characteristics are characteristics passed in to you from your parents.
The resemblance to your parents is in the genetic information passed on to you
in the sex cells (gametes)
Inside the nucleus there are thread like structures called…

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Fusion Cell Cloning:




Adult cell cloning ­ You fuse the nucleus of one cell with the empty egg of
another animal. Then you place the embryo in a third animal. It develops there
and is born.
Genetic engineering/modification is used to change an organism and give it
new characteristics which…

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farmers need to buy ne seeds. People want to manipulate the genes of their
future children.

EVOLUTION

Fossil fuels provide us with evidence of how much or how little different
organisms have changed.
The theory of evolution tells us that all the species of living things alive have
evolved from…

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More rice fields and cattle have increased methane levels.
Improving your quality of life without compromising future generations is
known as sustainable development.
You can help sustainable development by recycling, making our homes energy
efficient and avoid using cars when possible.
Brown field sites are towns and cities. Green field…

Comments

aun

good thank 

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