Which one is absent in frog?

Phrenic nerve

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Renal portal vein

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Both A and B

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None of the above

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Solution

The correct option is A Phrenic nerve
The phrenic nerve originates in the neck ( $C_{3}$ - $C_{5}$ ) and passes down between the lung and heart to reach the diaphragm. It is important for breathing, as it passes motor information to the diaphragm and receives sensory information from it. It is present in humans, and absent in frog.

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