9 terms

IGCSE Biology - Smoking

Key terms from Edexcel IGCSE Biology on the topic of Smoking
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Bronchitis
Inflammation of the mucus membranes of the bronchi. Commonly caused when cigarette smoke paralyses the cilia lining the air passages, preventing mucus being swept away from the lungs.
Emphysema
A lung disease caused when cigarette smoke damages alveoli causing them to become enlarged and inefficient for gas exchange. A person with this disease will suffer breathlessness.
Lung cancer
A disease characterised by uncontrolled cell growth in the tissues of the lungs
Nicotine
Strongly addictive drug present in cigarettes
Tar
Toxic matter produced by burning tobacco that can collect in the lungs of smokers
Carcinogen
Cancer causing substance or agent
Tumour
A mass of cells that have mutated and divided out of control
Carbon Monoxide
A toxic gas present in cigarette smoke. It can enter the blood from the lungs where it combines with haemoglobin, blocking the blood's ability to carry oxygen to body cells.
Carboxyhaemoglobin
A compound formed when haemoglobin combines with carbon monoxide in preference to oxygen
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