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    Biology A-Level

    pulmonary and systemic circuits

    What pulmonary and systemic circuits means in Biology A-Level, as defined for AQA, OCR.

    Definitions of pulmonary and systemic circuits

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    Reference: AQA

    Blood flows through these circuits in series, with blood passing through the heart twice for every complete circuit of the body.
    AQA · Mass transport in animals (study guide)
    A double circulation has a pulmonary circuit to the lungs and a systemic circuit to the body.
    OCR · Transport in animals (study guide)

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