- pulmonary circulation
the circulation of blood from the heart to the lungs for oxygenation and back to the heart.
* * *system of blood vessels that forms a closed circuit between the heart and the lungs, as distinguished from the systemic circulation between the heart and all other body tissues. On the evolutionary cycle, pulmonary circulation first occurs in lungfishes and amphibians, the first animals to acquire a three-chambered heart. The pulmonary circulation becomes totally separate in crocodilians, birds, and mammals, when the ventricle is divided into two chambers, producing a four-chambered heart. In these forms the pulmonary circuit begins with the right ventricle, which pumps deoxygenated blood through the pulmonary artery. This artery divides above the heart into two branches, to the right and left lungs, where the arteries further subdivide into smaller and smaller branches until the capillaries in the pulmonary air sacs (alveoli) are reached. In the capillaries the blood takes up oxygen from the air breathed into the air sacs and releases carbon dioxide. It then flows into larger and larger vessels until the pulmonary veins (usually four in number, each serving a whole lobe of the lung) are reached. The pulmonary veins open into the left atrium of the heart. Compare systemic circulation.
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См. также в других словарях:
Pulmonary circulation — is the portion of the cardiovascular system which carries oxygen depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart. The term is contrasted with systemic circulation.CourseIn the pulmonary circulation … Wikipedia
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pulmonary circulation — noun circulation of blood between the heart and the lungs • Hypernyms: ↑circulation * * * noun : the passage of venous blood from the right auricle of the heart through the right ventricle and pulmonary arteries to the lungs where it is… … Useful english dictionary
pulmonary circulation — a system of blood vessels effecting transport of blood between the heart and lungs. Deoxygenated blood leaves the right ventricle by the pulmonary artery and is carried to the alveolar capillaries of the lungs. Gaseous exchange occurs, with… … The new mediacal dictionary
pulmonary circulation — noun The part of blood circulation which carries oxygen depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart … Wiktionary
pulmonary circulation — noun Date: circa 1890 the passage of blood from the right side of the heart through arteries to the lungs where it picks up oxygen and is returned to the left side of the heart by veins … New Collegiate Dictionary
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