AQA B1 a

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  • Created on: 17-02-10 19:54
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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
Module 1a ­ Biology ­ Human biology
You
sho
uld
kno
w
abo
ut
the
foll
owi
ng
fou
r
are
as:
1 Co-ordination and
control
The nervous system and the
hormone system co-ordinate your
body
The input to the nervous
system is by the sense organs which
detect stimuli
Stimuli are changes in your
environment
The sense organs are the
ears, nose, tongue, eyes and skin
Remember that the ears
detect balance/movement as well as
sound
The tongue and nose both
detect chemical stimuli
2 The brain and the spinal cord
make up your Central Nervous
System (CNS)
Page 1
10/02/2010
We love biology! SO LEARN THIS WELL!!!

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
This is where all your sensory
input and responses are
co-ordinated
The sensory neurones carry the
input impulses
The motor neurones carry
impulses which make you respond
A neurone is another name for a
nerve cell
The impulses are electrical
signals that carry information
to/from the CNS
3 Some stimuli produce an
automatic response
We call these reflexes.
The pathway of the
neurones is a reflex arc
Reflexes are very fast.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
5 More about co-ordination
and control....
In women, the menstrual cycle is
controlled by hormones. It lasts
about 28 days
Day 1 ­ 5 is the menstrual period;
ovulation happens around day 14.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
The disadvantage is that it is
very expensive and doesn't
always work
8 Our cells are very easily
damaged.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
Our metabolic rate is the speed
at which our body does chemical
reactions. It is linked to how
much exercise we take and to
how much muscle and fat we
have. Our metabolic rate stays
high for a while after exercise.
The more regular exercise we
do, the fitter we are.
The less exercise we take, the
less food we need.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
help to reduce cholesterol
levels
In some people, too much salt
may increase the risk of high
blood pressure
Fast food ( processed food)
often contains high levels of
fat and salt
12
Drug
abuse!
Some drugs can be good for you but A drug is something that changes the body's chemical
others harm the body. processes
Indigenous people have known about Dependent people are addicted to drugs.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
15 Tobacco smoke contains many
dangerous substances
Nicotine is the addictive
substance in tobacco smoke
Carcinogens in tobacco smoke
may cause cancer of different
organs
The link between smoking and
lung cancer has been agreed over
many years
Carbon monoxide in tobacco
smoke makes the blood carry less
oxygen
This is dangerous in preganant
women as the foetus may not get
enough oxygen.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
Bacteria and viruses may
reproduce rapidly inside
the body
They may make poisons
(toxins) which make us
feel ill.
Viruses are much much
smaller than bacteria; they
are not cells
They are just a protein
coat around some genetic
material
Viruses reproduce inside
our cells and damage
them.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
Antibiotics can't kill viruses
which live and reproduce inside
our cells
It is hard to kill viruses
without killing our own cells
Many bacteria have developed
resistance to antibiotics.…read more

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LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN, LEARN,
It was given to many pregnant
women but it had not been
tested on pregnant women
Many women gave birth to babies
with severe limb abnormalities
The drug was banned
Recently Thalidomide has been
used successfully to treat
leprosy
23. More about Controlling
Infectious Disease 2.…read more

Comments

misbah

HELLO HAFSAH DO YOU HAVE A B1 b SECTION???

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