The opening of right atrium into right ventricle is guarded by _______Amitral valveBtricuspid valveCbicuspid valveDaortic semilunar valveAnswer: B. tricuspid valve Read Explanation: The tricuspid valve is on the right dorsal side of the mammalian heart between the right atrium and right ventricle. The function of the valve is to prevent back flow of blood into right atrium. Read more in App