Biology for IGCSE & O level - Transport In Animals (Section 1 - No. 32)
What are the key advantages of a double circulatory system?
Blood passes through the heart only once in each circuit.
Oxygenated and deoxygenated blood do not mix.
Blood is kept at higher pressure in systemic circulation.
Provides a greater supply of oxygen and nutrients to respiring tissues.
Explanation
A double circulatory system, as found in mammals, keeps oxygenated and deoxygenated blood separate, allowing for higher blood pressure in the systemic circulation, which helps to supply tissues with oxygen and nutrients more efficiently.
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