Opening of inferior vena cava, Chordae tendineae, Septomarginal trabecula, Right AV valve (tricuspid), Pulmonary valve - heart structure components facilitating blood flow.Here are the features of the heart labeled using the hints provided:Opening of inferior vena cava: This is the large opening on the back of the right atrium where deoxygenated blood from the body enters the heart.Chordae tendineae: These are thin, thread-like tendons that attach to the tricuspid valve and the papillary muscles.They help to prevent the valve from ballooning back into the atrium when the ventricle contracts.Septomarginal trabecula: This is a muscular ridge that runs along the inner wall of the right ventricle.It helps to improve the efficiency of blood flow by directing blood towards the pulmonary valve.Right atrioventricular (AV) valve: Also known as the tricuspid valve, this valve is located between the right atrium and the right ventricle.It has three cusps, or flaps, that open and close to allow blood to flow from the atrium to the ventricle.Pulmonary valve: This valve is located between the right ventricle and the pulmonary artery.It has three cusps that open and close to allow blood to flow from the ventricle to the lungs....

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