The heart of a frog differs from that of a ra | vedclass

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(A) The heart of a frog is $3$-chambered, consisting of two atria and one ventricle. It also possesses a triangular structure called the $Sinus venosu

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Sinus venosus

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(A) The heart of a frog is $3$-chambered, consisting of two atria and one ventricle. It also possesses a triangular structure called the $Sinus venosus$ which joins the right atrium and receives deoxygenated blood from the body. In contrast, the heart of a rabbit (a mammal) is $4$-chambered and lacks a $Sinus venosus$. Therefore, the presence of the $Sinus venosus$ is a characteristic feature that distinguishes the amphibian heart from the mammalian heart.

The heart of a frog differs from that of a rabbit due to the presence of which of the following?

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