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Which one of the following vertebrate organs receives the oxygenated blood only?

1. Gill
2. Lung
3. Liver
4. Spleen

Correct answer: Lung

Solution

The lung receives blood from the pulmonary veins after it has been oxygenated in the alveoli, so it is the organ associated with oxygenated blood. The other listed organs receive mixed or systemic arterial blood, not exclusively oxygenated blood in this context.

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