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Q.

The sac-like structure located on the dorsal side of the heart of the frog is

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a

conus arteriosus

b

sinus venosus

c

coronary sinus

d

dorsal aorta

answer is B.

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Detailed Solution

Blood from two precaval veins and one postcaval vein first enters a triangular structure called sinus venosus, which opens into the right atrium.

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The sac-like structure located on the dorsal side of the heart of the frog is