A 45 yo come to GP because of recurrent episodic non bloody, watery diarrhea, happens mostly after drinking alcohol. Wife says when he drinks alcohol, his face turns red and he starts coughing and wheezing. Chest x ray shows left upper lobe lung mass. 1. What is the likely underlying cause of this patients condition? 2. What features suggest this? 3. What causes the presentation of these clinical features with this condition?

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).