The Organ We Love - How The Heart Works
Below is a MRR and PLR article in category Health Fitness -> subcategory Cardio.
The Organ We Love: Understanding How the Heart Works
Summary
The heart, the body's strongest muscle, pumps blood through our vessels via rhythmic contractions. It regulates blood pressure and volume by secreting a potent peptide hormone known as ANF. This hormone influences the brain's regulatory regions, as well as the kidneys, blood vessels, and adrenal glands.
How the Heart Works
Contrary to popular belief, the heart is not located solely on the left side of the body. It's actually situated in the center of the chest, slightly to the left, beneath the sternum. Protected by a sac called the pericardium and flanked by the lungs, the heart is surprisingly delicate. Weighing around 300 grams, it comprises four chambers: two upper atria and two lower ventricles. Valves between these chambers ensure proper blood flow.
The heart's role in circulating blood throughout the body is significant. Each heartbeat is a sequence known as the cardiac cycle, derived from the Greek word "cardiac," meaning "heart." This cycle includes three major phases: atrial systole, ventricular systole, and complete cardiac diastole.
During atrial systole, blood exits the atria, and atrioventricular valves close to prevent backflow, creating the heartbeat sound. Then, during ventricular systole, the ventricles contract, sending blood into the circulatory system. Valves named "pulmonary" and "aortic semilunar" close afterward to prevent backflow. Finally, during complete cardiac diastole, the heart takes a brief pause, allowing blood to refill the chambers and begin the cycle anew.
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