3/4 Markers:
Double Circulatory System —> Higher blood pressure —> Faster blood flow to tissues —> more oxygen delivered —> more aerobic respiration —> more energy released
More RBCS → more haemoglobin → binds to more oxygen → more oxygen transported to cells → increase of aerobic respiration
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Key facts:
- Plasma transports glucose to cells around the body
- Pacemaker synchronises the heart contractions and is located in the right atrium
- Heart’s role: pushing blood so oxygen can get around the body
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The route blood takes in less than a minute…
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- Deoxygenated blood flows Heart → Lungs
- Oxygen diffuses from alveoli → blood
- Oxygenated blood flows Lungs → heart
- Oxygenated blood flows Heart → body
- Oxygen diffuses from capillaries → body cells
- Carbon dioxide diffuses From cells → blood plasma
- Deoxygenated blood flows Body → Heart via vena cava / veins
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Advantages:
- Saves lives in emergencies like severe blood loss
- Treats medical conditions like anaemia or haemophilia by replacing certain blood components
Disadvantages:
- Immune reactions if blood groups are mismatched
- Religious/ethical objections (e.g. some groups like Jehovah’s Witnesses may refuse)