Which structure in frog prevents the backflow of blood from ventricle to atria during ventricular contraction?
Spiral valve
Semilunar valves
Auriculo-ventricular valves
Sinus venosus
The auriculo-ventricular (A-V) valves are present between atria and ventricle and prevent backflow into atria during ventricular systole.
Spiral valve → regulates blood flow in truncus arteriosus
Semilunar valves → prevent backflow into ventricle
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