Deoxygenated blood first enters in _________ part in fishes?
Correct answer: A. Sinus venosus
- A. Sinus venosus
- B. Right atrium
- C. Left atrium
- D. Conus arteriosus
Explanation
In fish, blood returning from body tissues first enters the sinus venosus, which passes it to the atrium and then the ventricle. Fish have a single atrium rather than separate right and left atria, so students may incorrectly select right atrium by applying the mammalian heart plan.
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