Biology AS AQA Unit 1 Immunity

Made these notes for my year 12 summer exam to revise and read over. There are spelling mistakes in most of my files but due to the busy exam schedule I had no time to correct them (sorry).

Most files have more information than what is needed but I feel it helps you feel more confident walking into the exam if you have a greater knowledge background and may help when having to apply knowledge to questions. Good luck :)

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  • Created by: Chelcie
  • Created on: 02-09-13 12:36
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Immunity
NON SPECIFIC DEFENCE MECHANISMS
Do not distinguish between one pathogen and another. Either a barrier to stop entry of pathogens
or phagocytosis.

SPECIFIC
Do distinguish. Less rapid response but it provides long lasting immunity. The response involves a
lymphocyte (type of white blood cell). Either a cell mediated T…

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T lymphocytes mature in the Thymus gland and produced in the bone marrow.
T lymphocytes respond to an own cell that has been invaded by non-self material.
T lymphocytes can distinguish own cell/foreign cell with phagocytes that have engulfed and
broken down a pathogen display pathogens antigens on CSM called…

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Antigens of viruses are constantly changing.
Our antibodies or memory cells will not correspond with new shape of the virus so only the primary
immune response can overcome the infection.
We therefore develop symptoms.



ANTIBODIES
Antibodies are proteins synthesize by B cells.
Antibodies are made of four polypeptide chains.
One…

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Vaccination
Passive immunity
Immunity introduced by the antibodies to an individual from an outside source.

Active immunity
Active immunity is produced by stimulating the production of antibodies in the individuals own
immune system.

Vaccination is the introduction of a substance into the body to stimulate active immunity against a
particular…

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