The human heart is a muscular organ responsible for pumping blood throughout the body. It works in the following way:

1. **Blood Flow**: Blood returning from the body enters the right atrium, then flows through the tricuspid valve into the right ventricle.

2. **Pulmonary Circulation**: The right ventricle pumps the blood through the pulmonary valve into the pulmonary artery, which carries it to the lungs for oxygenation.

3. **Oxygenation**: In the lungs, blood picks up oxygen and releases carbon dioxide. Oxygenrich blood returns to the heart through the pulmonary veins, entering the left atrium.

4. **Systemic Circulation**: From the left atrium, blood flows through the bicuspid (mitral) valve into the left ventricle. The left ventricle then pumps it out through the aortic valve in to the aorta, which carries it to the rest of the body.

5. **Contraction (Systole) and Relaxation (Diastole)**: The heart contracts (systole) to pump blood and then relaxes (diastole) to allow chambers to refill.

6. **Electrical Signals**: The heart's rhythm is controlled by electrical signals generated by the sinoatrial (SA) node. This natural pacemaker initiates the heartbeat.

7. **Regulation**: The heart rate and strength of contractions are regulated by the autonomic nervous system, which responds to the body's needs (e.g., during exercise or rest).

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