A 49 yo African American women comes to GP due to SOB, cough and chest pain. Temp is 98.6 F, pulse is 65, resp is 17 and BP is 125/83. Crackles over lung fields are heard on auscultation. Chest X ray shows hilar lymphadenopathy and biopsy of one of the lymph nodes is consistent with a diagnosis of sarcoidosis. 1. What histologic finding would you see on biospy that would confirm the diagnosis?

The main function of the respiratory system is gas exchange (O2 and CO2). Ventilation is the movement of air through the respiratory tract into (inspiration) and out of (expiration) the respiratory zone (lungs).