A 45-Year-Old Man Is Evaluated for Persistent Cough and Progressive

question 79

Multiple Choice

A 45-year-old man is evaluated for persistent cough and progressive dyspnea on exertion.  The patient has no medical issues but has been exposed to large quantities of coal dust while working as a miner for the past 15 years.  Chest imaging reveals small, nodular opacities in the upper lobes.  Lung biopsy shows fine carbon particles within the patient's respiratory bronchioles and alveolar ducts.  Which of the following mechanisms is most directly responsible for clearing the foreign particles from this patient's respiratory tract?

• A)Coughing and sneezing
• B)Immunologic memory
• C)Mucociliary transport
• D)Phagocytosis
• E)Upper airway trapping

---

Definitions:

Preferred Stock

A type of stock that provides dividends before any dividends are provided to common stockholders and typically has rights to assets over common stock in the event of a company liquidation.

Participating Preferred Stock

A type of preferred stock that provides dividends and an additional right to participate in the excess profits of the company after the common stock dividends have been paid.

Convertible

Refers to a financial instrument, like a bond or share, that can be transformed into another form of financial asset, like shares of the company's stock.

Dividends Paid

Dividends paid refer to the portion of a company's earnings that is distributed to shareholders as a reward for their investment.