portion of the serous membrane that covers and adheres to the lung is called the

portion of the serous membrane that covers and adheres to the lung is called the . The portion of the serous membrane that covers and adheres to the lung is called the . pleural cavity parietal pleura fibrous sac visceral pleura

The Correct Answer and Explanation is :

The portion of the serous membrane that covers and adheres to the lung is called the visceral pleura.

Explanation

The pleura is a double-layered serous membrane surrounding the lungs, which plays a vital role in respiratory mechanics and lung protection. It consists of two main layers: the visceral pleura and the parietal pleura.

1. Visceral Pleura: This inner layer directly covers the lungs, following their contours and recesses, such as the fissures between the lobes. It is intimately attached to the lung tissue and is essential for maintaining the lungs’ structure. The visceral pleura produces pleural fluid, which is crucial for lubrication, allowing the lungs to expand and contract smoothly during breathing.
2. Parietal Pleura: In contrast, the parietal pleura lines the thoracic cavity’s interior surface, including the mediastinum and diaphragm. It is not in direct contact with the lungs but creates a protective barrier for the pleural cavity.
3. Pleural Cavity: This is the potential space between the visceral and parietal pleurae. It contains pleural fluid, which acts as a lubricant to reduce friction between the two layers during respiratory movements.
4. Fibrous Sac: The fibrous sac is a tougher, fibrous layer surrounding the pleural cavity and providing additional structural support and protection for the lungs and thoracic organs.

The interaction between the visceral and parietal pleura is critical for effective lung function. During inhalation, the diaphragm and intercostal muscles contract, creating negative pressure in the pleural cavity. This negative pressure helps draw air into the lungs, facilitating gas exchange. Any pathology affecting the pleura, such as pleuritis or pleural effusion, can significantly impact respiratory efficiency and overall lung health.