Arrange the following organs of the Human respiratory system from...

The human respiratory system is situated in the thoracic cavity, which is the outermost structure among the given options.

Inside the thoracic cavity, the lungs are present. The lungs are enclosed by a double-layered pleura (pleural membranes), consisting of an outer parietal pleura in contact with the thoracic lining and an inner visceral pleura in contact with the lung surface. Therefore, the pleural membranes are encountered after the thoracic cavity and before the main lung tissue.

Deep inside the lungs, the terminal bronchioles open into thin-walled, vascularised bag-like structures called alveoli.

Thus, the correct arrangement from outside to inside is: Thoracic cavity, pleural membranes, lungs, alveoli.

Answer: Thoracic cavity, pleural membranes, lungs, alveoli