The left atrium serves as a vessel for blood coming from the lungs and a pump to deliver blood to other parts of the heart, according to Healthline. Oxygen-rich blood from the lungs goes to the left atrium via the pulmonary vein.Know More
The left atrium is one of the heart’s four chambers, and it is found on the left posterior side, says Healthline. It has slightly thicker walls than the right atrium. Once oxygen-rich blood enters the left atrium, the blood is pumped through the mitral valve into the heart’s left ventricle chamber. It is then pumped into the rest of the body to deliver oxygen.
The University of Rochester Medical Center explains that the heart is composed of four chambers; the upper chambers are called atria, while the lower chambers are known as ventricles. Blood goes through a valve before leaving the heart’s chambers. The valves prevent backward blood flow and serve as one-way inlets for blood entering a ventricle and one-way outlets for blood leaving a ventricle. They open and shut as the heart contracts and relaxes, allowing blood to enter the ventricles and atria alternately. The aortic valve closes and the mitral valve opens so that blood flows into the left ventricle from the left atrium. More blood flows in the left ventricle as the left atrium contracts.Learn more about Organs
The heart is the muscular organ situated in between the lungs, behind the sternum and slightly tilted towards the left side of the breastbone. Rhythmic muscular contractions activate the heart to pump blood through a system of arteries and veins called the cardiovascular system.Full Answer >
Pleural fluid prevents friction between the lungs and the chest cavity during respiration, and is found in a thin space between two layers of tissue. The tissues surrounding the lungs produce the fluid that rhythmically ebbs and flows in the small pleural space.Full Answer >
The respiratory membrane allows gases to be exchanged between the pulmonary capillaries, or blood vessels, and the respiratory units of the lungs, which consist of bronchioles, alveolar ducts, atria and alveoli, according to John E. Hall in the Guyton and Hall Textbook of Medical Physiology. This exchange transports oxygen from the alveoli into red blood cells and carbon dioxide from blood cells into the alveoli.Full Answer >
Pulmonary alveoli are the tiny sacs inside the lungs that fill with air with each breath and facilitate the exchange of gas with the blood. According to HowStuffWorks, the oxygen concentration in the alveoli is high, relative to that of the surrounding tissues, which permits easy passage to the blood.Full Answer >