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Amar Patel HGS

Biology Revision:

How do humans' bodies respond to changes inside them and to their

Explain what a stimulus is by highlighting examples and what organs they stimulate.
Describe how a nervous response is brought about by stimuli, including the roles of
receptors, sensory neurones, the coordinator…

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Amar Patel HGS

Describe the dual role of FSH, secreted by the pituitary, of causing eggs to mature in ovaries
and to stimulate the production of oestrogen from the ovaries.
Describe the dual role of oestrogen of inhibiting further FSH production and of stimulating the
pituitary to produce LH.

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Amar Patel HGS

Recall that too much slat in the diet can lead to increased blood pressure for about 30% of the
Understand that processed food often contains a high proportion of fat and/or salt.

CHD ­ Coronary Heart Disease
CVD ­ Cardiovascular Disease

CHD is just the diseases…

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Amar Patel HGS

o Extensive Clinical trials in various stages (side effects). [5 years]
o Drug licensed for sale, if safe and effective.
Tolerance ­ this is where the body gets used to the drug and more has to be taken to get the
same effect.
Addiction ­ this is…

Page 5

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Amar Patel HGS

1990 Until as late as 1997 some people in tobacco companies disputed the link. At this point
s they were forced to accept evidence as they were sued by 40 US states to pay for
treatment costs.

2000 It is now an accepted fact that smoking increases…

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Amar Patel HGS

Sterilization (radiation/heat)
Antiseptic (for living tissue)
Disinfectant (for non-living tissue)
Good diet

Ignaz Semmelweis
He noticed that in a normal hospital, where doctors delivered babies, the mortality rate
was higher (10%) compared to in a maternity hospital where maternity nurses delivered babies (1%).

Possible explanations…

Page 7

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Amar Patel HGS

o Occurs during infection. It is active because your body fights an invading pathogen
with antibodies
Artificial Passive
o Used during potentially fatal diseases. Injection of readymade antibodies provides an
instant temporary response. Eg tetanus and rabies
Artificial Active
o Injecting or taking dead pathogens by mouth.…

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Amar Patel HGS

Diseases can spread very rapidly through a population that is not immune to the pathogen that
causes the disease.

Pandemic ­ Disease that has spread across the globe
Epidemic ­ Disease that is localised

Why do they occur?

How can we prevent them?
o This is…

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Amar Patel HGS

Water ­ chemical reactions take place in water
Temperature ­ enzymes work best
Light ­ energy input for food chains
Air - respiration

Suggest factors for which organisms (animals and plants) are competing in a given habitat
Suggest reasons for distribution of animals and plants in a…

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Amar Patel HGS

Year 10
Topic 11.6 ­ Why are individuals of the same species different from each
other? What new methods do we have for producing plants and animals
with characteristics we prefer?


DNA (deoxyribonucleic acid) ­ molecule/chemical that stores the genetic instructions to make an


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