I. Anatomy of the Respiratory System
The number of alveoli can reach adult levels at 8-9 years of age
Second, the ventilation of the lungs
3. Pulmonary surfactant
IV. Airway resistance
V. Pulmonary circulation physiology
The mean pulmonary artery pressure is only 14mmHg, the pulmonary venous pressure is only 6mmHg, and the mean pulmonary capillary pressure Or hydrostatic pressure is only 8mmHg, normal adult pulmonary circulation blood volume is 400-600ml, accounting for 8%-10% of total blood volume.
Factors regulating pulmonary blood flow and resistance:
Pulmonary arterioles have no muscle tissue, so the changes in the inner diameter of the vessels in this segment are mainly affected by transmural pressure.