Which of the following best describes the mechanism of blunt thoracic trauma associated with blast injuries?

An air embolism associated with diving occurs when:

A. the diver hyperventilates prior to entering the water. B. the diver holds his or her breath during a rapid ascent. C. the alveoli completely collapse due to high pressure. D. high water pressure forces air into the mediastinum.

The respiratory symptoms of lung cancer include a cough that worsens over time and ______, or coughing up blood.