Lungs are covered with double layered thin membranous sac called___________?
Correct answer: B. Pleura
- A. Disphragm
- B. Pleura
- C. Pericardium
- D. Rib cage
Explanation
The lungs are enclosed by the pleura, a double-layered membrane with a thin fluid-filled space that reduces friction during breathing. Students may choose the diaphragm because it moves the lungs during ventilation, but it is a muscle below the lungs rather than their membranous covering.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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