To explain: The major factor that causes pulmonary artery constriction.
Concept introduction: The capacity of pulmonary artery lumina decreases as the smooth muscle in the arterial walls contracts. Contraction and relaxation of the pulmonary artery occur in response to the local humoral conditions. Pulmonary artery constriction is a physical phenomenon in which the small pulmonary arteries compress due to the alveolar low oxygen level.
To explain: The factors that affect the pulmonary artery constriction.
Concept introduction: The capacity of pulmonary artery lumina decreases as the smooth muscle in the arterial walls contracts. Contraction and relaxation of the pulmonary artery occur in response to the local humoral conditions. Pulmonary artery constriction is a physical phenomenon in which the small pulmonary arteries compress due to the alveolar low oxygen level.
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