Edexcel IGCSE Biology · Spec 2.69
Double Circulation
The pulmonary and systemic circuits, and why a double circulation is more efficient than a single one.
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Double Circulation
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Spec 2.69
What you need to know
- Explain what double circulation means
- Describe the two circuits
- Explain why double circulation is efficient
Active recall
Quick check
Answer each question before opening the answer.
What is a double circulatory system?
Blood passes through the heart twice for each complete circuit — a pulmonary circuit to the lungs and a systemic circuit to the body.
What is the advantage of double circulation?
Blood can be pumped to the body at high pressure, giving a faster flow and better oxygen delivery.
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