In the anatomy of a frog's heart, the single ventricle opens into a specialized sac-like structure located on the ventral side. Identify this structure from the given options.

Step-by-step solution

The heart of a frog consists of three chambers: two atria and one ventricle. The ventricle opens into a sac-like structure on the ventral side of the heart known as the conus arteriosus. The sinus venosus is a triangular structure on the dorsal side of the heart that receives blood from the major veins (vena cava) and opens into the right atrium. Answer: Conus arteriosus