AQA Biology GCSE Unit 1 revision notes

This contains all the notes that I made for my Unit 1 exam for AQA biology at GCSE.

I hope this helps you!

There are 18 pages in total. Each 'section' (e.g. 11.2) is clearly underlined and in bold so you can easily find each 'section'

Document is in word 2003 version.

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  • Created by: Katie
  • Created on: 02-11-09 22:50

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Page 1

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Biology Revision:

Topic 11.1 ­ How do humans bodies respond to changes
inside them and to their environment?

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…

Page 2

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oestrogen and progesterone.

e stimulating hormone) ­ egg
mature + oestrogen to be

thickens uterus lining + inhibits
FSH
ng hormone) ­ egg is released
from ovary + stimulates

Describe how hormones control both the monthly release of an egg and the
varying thickness of the lining.
Recall the location…

Page 3

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Explain that in the developed world the abundance of food leads to weight gain
which causes the following diseases arthritis, diabetes, high blood pressure,
heart disease.
Discuss the problems associated with the lack of food in the developing world that
include reduced resistance to infections and irregular periods in women.…

Page 4

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Notice a wider range of taste in food as taste buds adjust to having less salt.

Cholesterol:
Cholesterol is a substance made in the liver. It is found in the blood stream. The
amount of cholesterol produced by the liver depends on a combination of diet and
genes. High levels…

Page 5

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During the 1940s and 1950s the number of deaths from lung cancer prompted
scientists to investigate the cause.
Possible causes?
- Pollution?
- Wet tar?
- Smoking?

Sir Richard Doll was commissioned by the Medical Research Council to investigate a
possible link between smoking tobacco and lung cancer.
He visited…

Page 6

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Explain how our bodies are perfect hosts for microbes and as such they invade us
and reproduce rapidly. This may cause harm by the production of toxins and the
death of cells in which viruses reproduce.
We are warm (37 Degrees C).
We are moist.
We have sugars on the…

Page 7

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Infectious diseases:

Good hygiene (washing hands)
Sterilization (radiation/heat)
Antiseptic (for living tissue)
Disinfectant (for non-living tissue)
Vaccination
Good diet
Quarantine

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…

Page 8

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What are the different types of immunity?
Natural Passive
o Mother to child through placenta or milk
Natural Active
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…

Page 9

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More cases of MMR due to less people vaccinated
Increase of autism due to more cases being correctly diagnosed
The Lancet has publically stated that had it known all the facts, it wouldnt have
published the article.

Pandemics and Epidemics
Diseases can spread very rapidly through a population that is…

Page 10

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Oxygen (not all)
Nutrition
Correct range of temperature

Adaptations include:
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…

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BHS2014

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Will these notes still cover the 2014 syllabus?

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