MCQs On Respiratory System 1. In which part of the respiratory system, gaseous exchange takes place? (a) Alveoli (b) Pharynx (c) Larynx (d) Trachea Sol. (a) Alveoli. 2. ___________ is located between two pleural sacs and is the central compartment of the thoracic cavity? (a) Hilum (b) Pleura (c) Mediastinum …