Why Must Blood Follow a Double Circuit (Pass Through the Heart

question 84

Multiple Choice

Why must blood follow a double circuit (pass through the heart twice before moving out to the body) ?

• A) Blood must be oxygenated in the pulmonary circuit prior to moving to the systemic circuit where it moves out to the body.
• B) Blood must pick up nutrients in the gut prior to entering the heart a second time to be oxygenated in the pulmonary circuit.
• C) Blood does not move through the heart twice before moving out to the body.
• D) Blood must go to organs with high oxygen demands prior to moving back to the lungs in the pulmonary circuit.
• E) Both the pulmonary and systemic circuits bypass the heart,which acts only to provide pressure to move the two systems.

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