From the time we are born till the time we die there is a muscle inside of us that is the root of our existence, it’s a muscle so dominant that we can actually hear and feel it throughout our growth, daily activities, and emotions of our everyday life.
Inside our body there is a powerful muscular pump, which is known as the one of the main organs in the human body. This hollow, cone shaped, pump lies slightly left within the center of the chest called our heart. The heart is made up of different structures and actions in order for it to work, combined with a network of blood vessels form what we know as the cardiovascular system.
The heart size varies with body size pumping blood to all parts of the body non-stop from birth until death. It is surrounded by three layers of tissue the outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium. The internal cavity of the heart is divided into two halves, which are then divided into four major chambers called the right atrium, right ventricle, left atrium and left ventricle. The right and left atrium are the two superior cardiac chambers that collect blood entering the heart sending it to the ventricles; therefore, the right atrium receives blood from the superior vena cava and the inferior vena cava, while the left atrium receives blood from the lungs through the pulmonary veins, two from the right lung and two from the left lung. However, the right and left ventricles forms the two lower cardiac chambers that collect blood from the upper chambers pumping it out of the heart. As follows, the right ventricle pumps oxygen-poor blood through the pulmonary trunk, which divides it to form the left and right pulmonary arteries that lead to the lungs while the left ventricle pumps oxygen-rich blood through the aorta and the rest of the body. Because the heart is a pump, it needs a set of valves keeping
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