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The human heart is a highly efficient, muscular organ that acts as a double pump, driving the cardiovascular system to sustain life. Understanding its function involves exploring its structure, the double circulation system, and the cardiac cycle.
The heart is divided into four chambers: two upper atria that collect blood returning to the heart, and two lower ventricles that actively pump blood out. To ensure blood flows in only one direction, the heart relies on a system of one-way valves. These valves prevent backflow, ensuring that oxygen-depleted blood enters the lungs and oxygen-rich blood is successfully delivered to the rest of the body.
This process is known as double circulation, consisting of two distinct circuits. The pulmonary circuit pumps deoxygenated blood from the heart to the lungs, where it releases carbon dioxide and absorbs oxygen. The systemic circuit then pumps this newly oxygenated blood from the heart to the rest of the body, delivering vital fuel and nutrients to tissues and organs before returning the deoxygenated blood back to the heart.
This continuous pumping is governed by the cardiac cycle, which consists of two main phases: diastole and systole. During diastole, the heart muscle relaxes, allowing the chambers to fill with blood. During systole, the heart contracts, forcefully pumping the blood out. Operating continuously, a healthy adult heart beats roughly 100,000 times a day, circulating about five liters of blood every minute to meet the metabolic demands of the body.
