Smoking - much of the information needed for the Unit 2 OCR AS Biology Exam

Here's some information on the smoking section from Unit 2 of the OCR Biology Exam. It's probably best if you print this out and highlight the key bits yourself as it's not very colourful! Hope you find it useful however :)

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  • Created by: hols_95
  • Created on: 22-04-13 20:40

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Page 1

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SMOKING
CIGARETTES CONTAIN:

TAR
Settles on the lining of the airways and alveoli increasing the diffusion distance for gaseous
exchange
Chemicals in the tar may cause an allergic reaction which causes smooth muscle to contract
restricting the lumen of the airway
Tar paralyses or destroys cilia. They are then unable…

Page 2

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PROBLEMS CAUSED BY CHANGES TO THE BLOOD SYSTEM:

ATHEROSCLEROSIS
Carbon monoxide can damage the endothelium (inner lining) of the arteries
Damage caused is repaired by the action of white blood cells which encourage growth of smooth
muscle and deposition of fatty substances (such as LDL's and cholesterol)
The deposits are…

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