Читать книгу Manual of Equine Anesthesia and Analgesia - Группа авторов - Страница 80

Pulmonary artery → Arterioles → Capillaries → Pulmonary vein → Left atrium

 The pulmonary artery is the only artery in the body that carries deoxygenated blood, and the pulmonary vein is the only vein that carries oxygenated blood.

 Although the pulmonary circulation receives the same cardiac output as the systemic circulation, the pulmonary system remains a low‐pressure system due to the:Tremendous dispensability of the thin‐walled vessels.The large number of vessels that are not normally perfused but that can be recruited in times of increased output.

 Distribution of pulmonary blood vessels is an important component of ventilation/perfusion (V/Q) distribution and gas exchange.

 Unlike most tissues in the body, pulmonary tissues constrict when hypoxic (hypoxic pulmonary vasoconstriction) in an attempt to divert blood away from poorly ventilated alveoli. This phenomenon can contribute to V/Q mismatch, especially during anesthesia since atelectasis is common in anesthetized horses.

 The lung also receives blood flow through the bronchial circulation, a branch of the systemic circulation that perfuses the tissues of the respiratory system.