Frog heart has
AFive chambers including extra atria
BThree chambers (two atria + one ventricle)
CFour chambers (two atria + two ventricles)
DTwo chambers (one atrium + one ventricle)
Answer & Solution
Correct answer: B. Three chambers (two atria + one ventricle)
Frog heart is 3-chambered: two atria + one ventricle. The single ventricle mixes some oxygenated and deoxygenated blood, giving INCOMPLETE double circulation. Mammals and birds have full 4-chamber separation.
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