1. Multiple Choice: Which of the following structures is responsible for the exchange of gases in the lungs? A) Alveoli B) Bronchi C) Trachea D) Diaphragm Correct Answer: A) Alveoli Rationale: The alveoli are the tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs, which is essential for respiration. 2. True/False: The axial skeleton consists of 126 bones. Answer: False Rationale: The axial skeleton consists of 80 bones, including the skull, vertebral column, and thoracic cage, which form the central axis of the body.