A drop of blood would pass through the mitral valve before it passed through the tricuspid valve.

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A drop of blood would pass through the tricuspid valve before it passed through the mitral valve. The tricuspid valve is located between the right atrium and right ventricle, while the mitral valve is located between the left atrium and left ventricle. Blood flows from the right atrium through the tricuspid valve into the right ventricle, then through the pulmonary valve into the lungs to pick up oxygen, and then back to the heart through the left atrium and mitral valve into the left ventricle before being pumped out to the rest of the body through the aortic valve.

A Drop of Blood Would Pass Through the Mitral Valve