What is the function of the tricuspid and semilunar valves guarding the pulmonary artery? • What are the functions of the tendinous cords (chordae tendinae) and papillary muscles which are attached to the two flaps of the bicuspid valve to the ventricular walls? • How can the differences between the thickness of the atria and ventricular walls be explained? • How can differences between the thickness of the ventricular walls be explained?

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