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.

Column $I$ (Description)	Column $II$ (Example)
$A$. Aquatic respiratory organ	$I$. Skin
$B$. Organ which acts as urogenital duct	$II$. Ureter and opens into the cloaca
$C$. $A$ small median chamber	$III$. Cloaca that is used to pass faecal matter,urine and sperms to the exterior
$D$. $A$ triangular structure	$IV$. Sinus venosus which joins the right atrium and receives blood through vena cava

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

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