Concept:The heart has valves that ensure one-way blood flow between its chambers.
Explanation:The human heart has four chambers: two upper atria (auricles) and two lower ventricles.
The tricuspid valve is located on the right side of the heart.
It has three cusps or flaps.
This valve guards the opening between the right auricle (right atrium) and the right ventricle.
It prevents backward flow of blood from the right ventricle into the right auricle during ventricular contraction.
Hence, among the given options, the tricuspid valve is correctly placed between the right auricle and the right ventricle.
Answer:A. right auricle and right ventricle.