Which one of the following is considered as the pacemaker in the heart of a frog?

Pylangium

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Synangium

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Truncus

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Sinus venosus

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Solution

The correct option is D Sinus venosus
The pacemaker in the heart of frog is Sinus venosus, it is an enlarge region between right atrium and venae cavae. The vanae cavae opens into other chamber but not directly into auricles. Sinus venosus drains into right auricle.
Therefore the right answer is option "D".

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