EVERYDAY SCIENCE

Detailed explanation-1: -The additional chamber called sinus venosus is made up of two precavals on the dorsal side. These two precavals are fused with one post-caval and form a wide chamber. It is a dark-colored triangular structure. It has thin walls that open in the right auricle.

Detailed explanation-2: -The sinus venosus, an expanded area located between the vena cava and the right atrium, serves as the pacemaker in amphibians like the frog. It is triangular-shaped and is present on the dorsal side of the heart. It is formed by the union of three main vena cava. They are the two precavals and one post caval.

Detailed explanation-3: -The heart of the frog has two additional chambers; one is sinus venous and the other is truncus arteriosus. Truncus arteriosus is also known as conus arteriosus. Sinus venosus is a triangular, thin-walled chamber attached from the dorsal surface to the heart.

Detailed explanation-4: -Solution : A thin-walled, triangular chamber attached dorsally to the heart which opens into the right atrium is known as sinus venosus. Step by step video & image solution for What is sinus venosus? by Biology experts to help you in doubts & scoring excellent marks in Class 12 exams. What is sinus venosus?

Detailed explanation-5: -What is Sinus Venosus? The sinus venosus is a large quadrangular cavity that is a thin-walled chamber (60-90 m thick). It collects venous blood from all the organs of the body. It is present just before the right atrium.