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Page 1

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B1a 1 Co-ordination and Control
1.2 Responding to change
1.3 Reflex actions
1.4 The menstrual cycle
1.5 Controlling fertility artificially
1.6 Controlling conditions

B1a 1.1 Responding to Change
· It is the nervous system that enables you to react to your surroundings and co-
ordinates your behaviour
· The nervous…

Page 2

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B1a 1.2 Reflex Actions
· Automatic responses in your body happen when, for example, you touch something
hot or sharp and pull your hand away quickly before you even feel the pain. These
automatic responses are called reflexes
· Reflexes help all animals avoid danger because they happen so fast…

Page 3

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B1a 1.5 Controlling Conditions
· Your body's internal environment (i.e. the conditions inside your body) is very
important. Organs cannot work properly if it keeps changing, so many of the
processes taking place inside your body try to keep things as constant as possible.
This balancing act is known as…

Page 4

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B1a 2.3 Fast Food
· The amount of, and type of, fat you have in your body also affects you cholesterol
levels
· Cholesterol is a substance made in the liver, which is transported around the body in
blood. It is needed to make cell membranes, sex hormones and other…

Page 5

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B1a 3.2 Legal and Illegal Drugs
· The most common drugs around are everyday drugs, such as caffeine
· Many drugs used for medicinal purposes have no or little effect on your nervous
system, whereas all drugs which people use for pleasure affect your brain and
nervous system, and these…

Page 6

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B1a 4 Controlling infectious diseases
4.1 pathogens
4.2 defence mechanisms
4.3 using drugs to treat diseases
4.4 changing pathogens and mutation
4.5 developing new medicines
4.6 pathogen immunity
B1a 4.1 Pathogens
· An infectious disease is caused by a microorganism entering and attacking your
body. They are infectious because people…

Page 7

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B1a 4.3 Using Drugs to
Treat Disease
· When we have infectious
diseases, we take
medicines, but often they
don't destroy pathogens,
they simply ease the
pain, e.g. aspirin
· Drugs which do kill
disease-causing bacteria
are called antibiotics
· Alexander Fleming
discovered penicillin
after he came back from
a…

Page 8

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B1a 4.6 Pathogen immunity
· Every cell has unique proteins on its surface called antigens, and antigens on the
microorganism which get inside your body differ from those on your cells, which is
how your immure system recognises they are different
· Your white blood cells appear to `remember' the…

Page 9

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B1b 5.3 Competition in Animals
· Animals best adapted to their environment are most likely to succeed in competition
· Animals compete for many things, including water, territory and mates. Animals
which eat a wide range of plants are most likely to survive, as picky eaters will die of
starvation…

Page 10

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B1b 6.3 Cloning
· Plants can be cloned via cutting, which simply involves taking a small piece of the
plant, and if it is grown under the right conditions, new roots and shoots should
develop
· Many growers now use hormone rooting powders to encourage the cuttings
· Tissue culture…

Comments

Matthew House

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EXTREMELEY USEFUL REVISION NOTES

I CAN'T EMPHASISE HOW HELPFUL THEY WERE

 

Lauren

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Superb!!! :)

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