A 57 year old man with hx of COPD comes to gp due to flu like illness with productive cough. Current meds are: -Oral theophylline -Inhaled fluticasone He is prescribed a antibiotic and discharged. 5 days later he comes to ED due to tachycardia, insomnia and agitation. 1. What medication is most likely responsible for these findings and why?

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).