Question:
Identify the group in which sinus venosus is present but conus arteriosus is absent.
Identify the group in which sinus venosus is present but conus arteriosus is absent.
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Sinus venosus persists in reptiles; conus arteriosus becomes part of other heart structures.
Updated On: May 12, 2025
- Amphibia
- Reptilia
- Aves
- Mammals
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The Correct Option is B
Solution and Explanation
In reptiles, sinus venosus is present in primitive forms but conus arteriosus is either absent or merged into the ventricle. In amphibians, both structures are present. In birds and mammals, neither sinus venosus nor conus arteriosus is separately present.
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