What is the left atrium?

The left atrium is the right upper chamber of the heart. The lungs give oxygenated blood to this part of the heart, which then passes the blood into the left ventricle, the lower right ventricle of the heart. Blood comes to the left ventricle of four lung veins and passes through bicuspid valves on the left ventricle. The left chamber is then responsible for drawing oxygenated blood around the body. Together, the upper houses are referred to as "atriums" and are responsible for receiving blood from the veins. In fact, the left atrium is placed on the right side of the heart, because it is seen by someone who faces him, but on his left side is his own left hall of each person. The heart of the atrie has thin walls.

The newly oxygenated blood enters the left atrium through the pulmonary veins, two of which come each lung. The blood then passes through the atrioventricular opening, guarded by bicuspid valve. This valve has two flaps and allows you to pass blood into the left ventricle. It closes when the left chamber closes to prevent the blood from being sent back to the left atrium.

The sinoatrial node found in the right atrium is responsible for checking the contraction of the atrial and its signal is what the blood sends through the mitral valve from the left atrium. The walls of the left atrium are made of myocardium, which is a strong muscle that forms most of the heart structure. Myocardial muscle muscle due to heart fibers that are inside it.

After the blood was handed over to the left ventricle of the left atrium, it stays there until the chamber is filled. After a full chamber it happens. At the moment of contraction, the bicuspide valve opens and the aortic valve opens. Blood cannot pass back to the left atrium, so it is sent to the aorta and from there to the rest of the body. Aorta is the largest blood vessel in the body and measures a diameter of about 1 inch (2.5 cm).