As you know, itissues need oxygen and nutrients for human life. Oxygen comes from the lungs, which are colored red in the video above. arteries through which it is transported throughout the body. The blood that uses oxygen, shown in blue in the video veins back to the lungs to take up oxygen again. This movement of blood requires two separate pumps in both vascular systems. One pump takes oxygenated blood from the lung and sends it throughout the body; the other pump collects the oxygenated blood and sends it back to the lung. One of these pumps is on the right and one on the left. They are actually adjacent to each other, separated by a partition. So, the heart is one organ, but in fact Two separate consists of a pump. The upper chambers of the heart are called atria and the lower chambers are called ventricles. Both the right and left sides have their own atria and ventricles (note that because we are looking at the heart from the opposite side, the right side in the video is actually anatomically the left side).
Heart Cycle
As you can see in the video above, oxygenated blood comes to the right side of the heart via two large veins coming from the upper and lower body. The first stop is the right atrium. When this is completely filled with blood, the valve (tricuspid valve) opens and the blood empties into the right ventricle. When the right ventricle is completely full, it contracts and pumps the blood. Blood traveling through the outflow tract of the right ventricle opens the valve here (pulmonary valve). The blood then travels to both lungs for oxygen (One important point to note here is this: The same functions that occur on the right side also occur on the left side. at the same time takes place). In the lungs, carbon dioxide is removed from the blood and replaced by oxygen. Ooxygenated blood, sIt comes back to the heart through 4 pulmonary veins, 2 on the left and 2 on the right, but this time on the left side. The left atrium fills with blood and the valve (mitral valve) It opens and blood empties into the left ventricle. When the left ventricle is full, it contracts and pumps the blood out. This time the blood passes through the outflow tract of the left ventricle and opens the last valve (aortic valve). From there it is distributed throughout the body via the aorta, the largest vessel in the body. The heart's electrical system ensures that all this happens in a coordinated way. About 5 liters of blood are displaced in this way every minute. This cycle of the heart is repeated on average 100,000 times a day. This means that the heart of an 80-year-old person beats about 3 billion times without stopping.