Understanding Blood Flow: The Heart's Key Components

1. Superior and inferior vena cava. These two large veins carry deoxygenated blood from the body to the right atrium of the heart.

2. Right atrium. The right atrium is the first chamber of the heart that blood flows through. It receives blood from the superior and inferior vena cava and pumps it to the right ventricle.

3. Tricuspid valve. The tricuspid valve is a one-way valve that separates the right atrium from the right ventricle. It prevents blood from flowing back into the right atrium when the right ventricle contracts.

4. Right ventricle. The right ventricle is the second chamber of the heart that blood flows through. It pumps blood to the lungs through the pulmonary artery.

5. Pulmonary valve. The pulmonary valve is a one-way valve that separates the right ventricle from the pulmonary artery. It prevents blood from flowing back into the right ventricle when the pulmonary artery contracts.

6. Lungs. The lungs are where blood picks up oxygen and releases carbon dioxide. Oxygenated blood returns to the heart through the pulmonary veins.

7. Pulmonary veins. The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart.

8. Left atrium. The left atrium is the third chamber of the heart that blood flows through. It receives blood from the pulmonary veins and pumps it to the left ventricle.

9. Mitral valve. The mitral valve is a one-way valve that separates the left atrium from the left ventricle. It prevents blood from flowing back into the left atrium when the left ventricle contracts.

10. Left ventricle. The left ventricle is the fourth and final chamber of the heart that blood flows through. It pumps blood to the body through the aorta.

11. Aortic valve. The aortic valve is a one-way valve that separates the left ventricle from the aorta. It prevents blood from flowing back into the left ventricle when the aorta contracts.