Q.

In the frog's heart, sinus venosus is formed by the union of 

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a

three caval veins

b

two pulmonary arteries

c

three aortic arches 

d

two pulmonary veins

answer is C.

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Detailed Solution

The sinus venosus, an expanded area located between the vena cava and the right atrium, serves as the pacemaker in amphibians like the frog. It is triangular-shaped and is present on the dorsal side of the heart. It is formed by the union of three main vena cava. They are the two pre-cavals and one post-caval.

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