Question

The figure shows a diagrammatic view of the human respiratory system with labels. Select the option that gives the incorrect identification and main function or characteristic.

• A. Visceral pleura - Outermost membrane
• B. Parietal pleura - Innermost membrane
• C. Pleural cavity - The pleural fluid fills this space
• D. Diaphragm - Dome-shaped muscle that contracts to increase the volume of the thoracic cavity.

Answer 1

Answer: (A), (B)

Parietal pleura - Innermost membrane

The lungs are separated from the chest wall by two membranes called pleura. The outermost membrane (A) is called the parietal pleura and is attached to the chest wall. The innermost membrane (B) is called the visceral pleura and is attached to the outer surface of the lungs. Both the pleura secrete a serous fluid called pleural fluid. The pleural fluid fills the space in between both pleura, called the pleural cavity (C). The diaphragm (D) is a dome-shaped muscle that contracts to increase the volume of the thoracic cavity.