____ is a triangular structure present on the dorsal side of the heart of frogs and receives deoxygenated blood first.

conus arteriosus

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sinus venosus

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right atrium

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left atrium

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Solution

The correct option is B sinus venosus

The heart of frog has three chambers, two atria and one ventricle. There is a triangular structure on the dorsal side of heart known as sinus venosus. It is formed by the union of superior and inferior vena cava. It receives deoxygenated blood from different parts of the body and it opens into right atrium.
On the ventral side of heart, there is a sac like structure arising from the ventricle known as conus arteriosus. It supplies blood to different parts of the body.

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