Through which valve does blood flow from the right atrium to the right ventricle?

Blood flows from the right atrium to the right ventricle through the tricuspid valve. This valve, located between these two chambers of the heart, serves to prevent the backflow of blood when the ventricle contracts. The tricuspid valve has three cusps, which allows it to open widely during diastole (the relaxation phase) to let blood fill the right ventricle, and then close firmly during systole (the contraction phase) to ensure that blood is ejected into the pulmonary artery without regurgitating back into the atrium.

In contrast, the mitral valve allows blood flow from the left atrium to the left ventricle, the aortic valve regulates blood flow from the left ventricle into the aorta, and the pulmonary valve controls blood flow from the right ventricle into the pulmonary artery. Understanding the specific functions of each heart valve is critical for grasping the overall mechanics of blood circulation within the heart.