The ratio of a solution's solute to solvent is its:

Medical assistants should perform skills they have not been trained in if it is a medical emergency

Indicate whether the statement is true or false

Which of the following most accurately characterizes simple pneumothorax?

A) Untreated, it will lead to mediastinal shift and compression of the contralateral lung. B) It is a problem of ventilation—perfusion mismatch. C) It results from air entering the pleural cavity through a defect in the chest wall. D) It results from the creation of a one-way valve that continues to allow air into, but not out of, the pleural cavity.