What Is the Respiratory Membrane and What Is Its Role

Multiple Choice

What is the respiratory membrane and what is its role in ventilation?

A) It lines the nasal cavity, where it serves to warm and moisten inspired air.
B) It lines the bronchial tree, where it secretes a layer of protective mucus, which serves to purify air entering the respiratory tract.
C) It consists of the alveolar epithelium, the capillary endothelium and their joined basement membranes; it provides the surface through which gas exchange occurs.
D) It lines the thoracic cavity, where it aids in lung expansion.