The diaphragm and intercostal thoracic muscles alter the lung's pressure gradient, which generates ventilation driving force. These functions ensure the safety of the lungs and proper inspiration. The pleural cavity refers to the area between the parietal and visceral pleura, and pleural fluid fills the pleural cavity to lubricate the pleural surface and provide surface tension. It folds back to form two layers, and each layer is called parietal pleura and visceral pleura. Pleura (plural: pleurae) is a single membrane surrounding the lung. The lung structure is important for the mechanism of ventilation-perfusion coupling. The alveolar capillary specifically participates in perfusion to get in contact with the alveoli for the gas exchange and oxygen delivery to the body tissues. For the perfusion process, the circulatory organs of the cardiovascular system such as the heart, pulmonary arteries, pulmonary veins, and alveolar capillaries are involved. Within the lungs, the ventilation process specifically involves organs like respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli. The respiratory system and major airways participating in ventilation include the nostril, nasal cavity, mouth, pharynx, larynx, trachea, bronchus, and lungs. Ventilation-Perfusion coupling involves organs of the respiratory system and cardiovascular system. Diagram of anatomy of pulmonary alveolar structure Diagram of anatomy of lung structure Anatomy Respiratory system and cardiovascular system Lung diseases, cardiac shunts, and smoking can cause a ventilation-perfusion mismatch that results in significant symptoms and diseases, which can be treated through treatments like bronchodilators and oxygen therapy.

When the ratio gets above or below 0.8, it is considered abnormal ventilation-perfusion coupling, also known as a ventilation-perfusion mismatch. Ventilation-perfusion coupling maintains a constant ratio near 0.8 on average, while the regional variation exists within the lungs due to gravity. Anatomically, the lung structure, alveolar organization, and alveolar capillaries contribute to the physiological mechanism of ventilation and perfusion.

Ventilation is the movement of gas during breathing, and perfusion is the process of pulmonary blood circulation, which delivers oxygen to body tissues. Ventilation-perfusion coupling is the relationship between ventilation and perfusion processes, which take place in the respiratory and cardiovascular systems. Please introduce links to this page from related articles try the Find link tool for suggestions. This article is an orphan, as no other articles link to it.

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