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Summary Circulation
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Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
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Circulation summary notes23 February 2023 15:22
- Atrium- thin walled, elastic, stretches as it collects blood
- Ventricle- thicker walled, contracts strongly to pump blood distance
Double circulatory system
- Pulmonary circulation- heart to lungs to heart
- Systemic circulation- heart to body to lungs
- Blood goes in and out of heart twice
- Double circulation required by mammals to maintain a higher blood pressure in
both the pulmonary and systemic circulation - ensures oxygen is delivered to
respiring tissues to maintain a high metabolic rate
- High metabolic rate in order to maintain high body temperature -
thermoregulate
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