Which of the following structures is absent i | vedclass

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(C) $Sinus \ venosus$ is the first chamber of the heart in fish,amphibians,and reptiles. In fish,it receives blood from the cuverian ducts and hepatic

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Sinus venosus

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(C) $Sinus \ venosus$ is the first chamber of the heart in fish,amphibians,and reptiles. In fish,it receives blood from the cuverian ducts and hepatic veins and leads into the single auricle.In amphibians and reptiles,it receives blood from the three venae cavae and leads to the right auricle. Birds and mammals,including rabbits,do not possess a $sinus \ venosus$.

Which of the following structures is absent in a rabbit's heart?

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