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Title: GCSE Biology 1.2 - Respiration
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This is one of six topics in the unit.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This is one of six topics in the unit.
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Inspiration
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intercostal muscles: contract
ribcage: upwards, outwards
diaphragm: contracts, downwards
thoracic volume: increases
inside pressure: decreases
Expiration
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intercostal muscles: relax
ribcage: downwards, inwards
diaphragm: relaxes, upwards
thoracic volume: decreases
inside pressure: increases
The bell jar model
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Limitations of the bell jar model
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The glass tube is rigid, unlike the trachea, which has cartilage
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The rubber sheet pulls downwards, unlike the diaphragm, which only flattens
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04%
nitrogen: 79%
water vapour: varies
The percentage composition of expired air
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oxygen: 16%
carbon dioxide: 4%
nitrogen: 79%
water vapour: saturated
The use of lime water to indicate the presence of carbon dioxide
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uses a simple ‘huff and puff’ apparatus
Lime water goes cloudy in the presence of carbon dioxide
Title: GCSE Biology 1.2 - Respiration
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This is one of six topics in the unit.
Description: These are concise, exam-focused notes made using the WJEC specification and BBC Bitesize. (I achieved an A.) This is one of six topics in the unit.