Question

Which of the following statement is correct about sinus venosus?

• A. It is situated on dorsal surface of rabbit heart
• B. It is situated ventrally in frog heart
• C. It sends blood to dorsal aorta
• D. It opens into right auricle

Answer 1

The correct option is D It opens into right auricle

Right auricle receives deoxygenated blood from the body via sinus venosus in the lower vertebrates. The sinus venous is a large quadrangular cavity, which lies in the atrium on the venosus side of the chordate heart. In non-mammalian chordates, the sinus venosus persists in the adult heart. In mammals, it exists only in the embryonic heart between the two venae cavae. It brings deoxygenated blood into the right auricle.

So, the correct answer is option D.