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De-oxygenated blood enters the right atrium. Blood then moves to the right ventricle which pumps blood from the heart to the lungs where it releases carbon dioxide and picks up oxygen.
Oxygenated blood leaves the lungs through pulmonary veins, completing the pulmonary cycle. This blood enters the left atrium, and is then transferred to the left ventricle which pumps the newly oxygenated blood back into the systemic circulation.
One of two lower chambers of the heart. In higher vertebrates, the left ventricle receives arterial blood from the left atrium and pumps it into the aorta, and the right ventricle receives venous blood from the right atrium and pumps it into the pulmonary artery.
An upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.
Pulmonary circulation is the portion of the cardiovascular system that carries oxygen-depleted blood away from the heart to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart. The term "pulmonary circulation" is readily paired and contrasted with systemic circulation. A separate system known as the bronchial circulation supplies blood to the tissue of the larger airways of the lung.
Oxygen-depleted blood from the body leaves the systemic circulation when it enters the right atrium through the superior (upper) vena cava and inferior (lower) vena cava. The blood is then pumped through the tricuspid valve (or right atrioventricular valve) into the right ventricle. Blood is then pumped through the semilunar valve and into the pulmonary artery.
From the right ventricle, blood is pumped through the pulmonary semilunar valve into the left and right pulmonary arteries (one for each lung) and travels through the lungs.
The pulmonary arteries carry deoxygenated blood to the lungs, where it releases carbon dioxide and pick up oxygen during respiration. Arteries are further divided in to very fine branches called the capillaries. In structure the capillaries are very thin walled, allowing for efficient gas exchange. Their function is to carry blood to all cells of the body.
The oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. This blood then enters the left atrium, which pumps it through the bicuspid valve, also called the mitral or left atrioventricular valve, into the left ventricle. The blood is then distributed to the body through the systemic circulation before returning again to the pulmonary circulation.
deoxygenated blood is pumped from right ventricle of heart into left and right pulmonary arteries, blood from pulmonary arteries travels to capillary bed of lungs: gas transfer with alveoli occurs, oxygenated blood in the lungs flows through the pulmonary veins to the left atrium of the heart, and oxygenated blood is pumped from left ventricle into the aorta