Constant Beat: The heart beats about 100,000 times per day, which amounts to around 2.5 billion beats over an average lifetime.

Size and Location: The heart is roughly the size of a closed fist and weighs about 250 to 350 grams. It's located slightly to the left of the center of your chest.

Electrical Impulses: The heart has its own electrical system. The sinoatrial (SA) node, often called the heart's natural pacemaker, generates electrical impulses that cause the heart to contract.

Blood Vessels: If you were to line up all the blood vessels in the human body, they would stretch over 60,000 miles (approximately 96,560 kilometers). That's enough to encircle the Earth more than twice!

Blood Pumps: In an average lifetime, the heart pumps about 1 million barrels of blood, enough to fill more than 3 supertankers.

Four Chambers: The human heart has four chambers: two atria (singular: atrium) and two ventricles. The right side pumps blood to the lungs (pulmonary circulation), while the left side pumps oxygenated blood to the rest of the body (systemic circulation).

Strong Contractions: The left ventricle is the strongest chamber of the heart. It pumps blood to the entire body and has enough force to shoot blood up to 30 feet (9 meters) in the air.

Heartbeat Sound: The "lub-dub" sound of a heartbeat is the sound of the heart valves closing. The first sound ("lub") is the closing of the atrioventricular valves, and the second sound ("dub") is the closing of the semilunar valves.

Unique Rhythms: Each person's heartbeat is unique, like a fingerprint. It can be influenced by factors such as age, fitness level, and emotional state.

Heartbeat Variations: The heart rate can change depending on various factors. For example, during exercise, it can increase to pump more oxygenated blood to the muscles. Conversely, during sleep or relaxation, it slows down to conserve energy.

Electrocardiogram (ECG/EKG): This test measures the electrical activity of the heart and is used to diagnose various heart conditions. It records the changes in electrical potential caused by the heartbeat.

Heart Health: Cardiovascular disease is a leading cause of death worldwide. Maintaining a healthy lifestyle, including a balanced diet, regular exercise, and not smoking, can significantly reduce the risk of heart-related problems.

Heart Transplants: The first successful heart transplant was performed by Dr. Christiaan Barnard in 1967. Since then, thousands of heart transplants have been carried out worldwide.

Emotional Symbolism: The heart is often used as a symbol of love and affection, although it doesn't actually have anything to do with emotions. This association likely arises from its role in pumping blood, which is essential for life.