(3)i) Epiglottis and sealing of the respiratory passage during swallowingii) C shaped cartilage rings and prevention of collapsing of trachea during breathingiii) Alveoli and absorption and exchange of gasiv) PLEURAL cavity and lubrication v) Diaphragm and separation of thoracic and abdominal cavity(4)i) The work of BREATHING is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.ii) During inhalation, the diaphragm contracts, so that its center moves caudally (downward) and its edges move cranially (upward). This compresses the abdominal cavity, raises the ribs upward and outward and thus expands the thoracic cavity. This expansion draws air into the LUNGS.iii)The chemical equation is C6H12O6 + 6O2 → 6CO2 + 6H2O (glucose + oxygen -> carbon dioxide + water).iv) (1) The residual VOLUME (RV) is the amount of air that is left after expiratory reserve volume is exhaled. The lungs are never completely empty. ... Therefore, there is always some air remaining in the lungs (2) Dead space is the volume of air that is INHALED that does not take part in the gas exchange, because it either remains in the conducting airways or reaches alveoli that are not perfused or poorly perfused(5)Write that yourself(•‿•)