Heart valves are crucial components that ensure blood flows in the correct direction through the heart. There are four main valves in the heart: 

1. **Aortic valve:** Situated between the left ventricle and the aorta, it controls blood flow from the heart to the body.

2. **Mitral valve:** Positioned between the left atrium and left ventricle, it regulates blood flow between these chambers.

3. **Tricuspid valve:** Found between the right atrium and right ventricle, it controls blood flow from the atrium to the ventricle.

4. **Pulmonary valve:** Located between the right ventricle and the pulmonary artery, it governs blood flow from the heart to the lungs.

These valves open and close in a coordinated manner, ensuring blood moves through the heart efficiently. Dysfunction or disease in these valves can lead to various heart conditions and may require medical intervention, such as valve repair or replacement. Would you like more detailed information on any specific valve?