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

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(C) The heart of a frog is $3$-chambered, consisting of two atria and one ventricle. In contrast, the human heart is $4$-chambered, consisting of two

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Sinus venosus

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(C) The heart of a frog is $3$-chambered, consisting of two atria and one ventricle. In contrast, the human heart is $4$-chambered, consisting of two atria and two ventricles. $A$ key anatomical difference is that the frog's heart possesses a $Sinus venosus$, a large triangular chamber that receives blood from the major veins before it enters the right atrium. Humans do not have a $Sinus venosus$ in their adult heart; instead, the veins open directly into the right atrium.

The heart of a frog differs from that of a human by the presence of:

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