Healthcare medical terminology
Anatomy of the Heart.
The human heart is about the size of a fist. It is located in the mediastinum of the throracic cavity, slightly left of the midline. The heart muscle has its own dedicated system of blood supply, the coronary arteries. The two main coronary arteries are called the left and right coronary arteries. They supply constant, uninterrupted blood flow to the heart.
The heart has four chambers. The upper chambers are called atria. The lower chambers are called ventricles. Between the atria and ventricles, and between the ventricles and vessels, are valves that allow blood to flow through in one direction. The issue walls between the chambers are called septa. The heart wall is constructed of three layers. The endocardium is the thin tissue that acts as a lining of each of the chambers and valves. The myocardium is the cardiac muscle surrounding each of these chambers. The pericardium is the double folder layer of connective tissue that surrounds the heart.
Blood Flow Through the Heart.
Blood is squeezed from the right atrium (RA) to the right ventricle (RV) through the tricuspid valve. Once in Right ventricle the blood is squeezed out through the semilunar valve through the pulmonary trunk and into the pulmonary arteries which carry blood to the lungs and are the only artery that carry deoxygenated blood. In the capillaries of the lungs, the CO2 is passed out of the blood and O2 is taken in. The now-oxygenated blood continues its journey back to the left side of the heart through the pulmonary veins. These are the only veins that carry oxygenated blood. The blood then enters the heart through the left atrium (LA ) and has to pass the mitral valve (MV), also termed the bicuspid valve, to enter the left ventricle ( LV). When the Left Ventricule contracts, the blood is finally push out through the aortic semilunar valve into the aorta and begins another cycle through the body.
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https://www.youtube.com/watch?v=kar9D31JnIs