2. Which of the following take place when we exhale? (1) Diaphragm relaxes and arches up (III) Rib cage is raised (II) Lungs expand (IV) Volume of thorax decreases
Explanation: When the lungs exhale, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.
