1/26/2016 Structures of the lower respiratory system Normal Microbiota of the Bronchiole Branch from (h Respiratory System Learning Objective Left lung Trache Characterize the normal microbiota of the upper and lower respiratory systems. Normal Microbiota of the Microbial Diseases of the Upper Respiratory System Respiratory System A wide variety of microorganisms Learning Objective colonize the upper respiratory tract Differentiate pharyngitis,laryngitis Normal microbiota suppress pathogens tonsillitis,sinusitis,and epiglottitis. by competing for nutrients and producing inhibitory substances Lower respiratory system is nearly sterile due to the ciliary escalator in the bronchial tubes 1/26/2016 2 Structures of the lower respiratory system Pharynx (throat) Larynx ( b) Bronchiole Branch from the pulmonary vein Branch from the pulmonary artery Blood (voice box) Trachea (windpipe) Right lung Bronchus Bronchiole Pleura Left lung H t Blood capillaries Alveoli Pleura Diaphragm (breathing muscle) Heart Normal Microbiota of the Respiratory System Learning Objective Characterize the normal microbiota of the upper and lower respiratory systems. Normal Microbiota of the Respiratory System • A wide variety of microorganisms colonize the upper respiratory tract • Normal microbiota suppress pathogens by competing for nutrients and pg y roducing inhibitory substances • Lower respiratory system is nearly sterile due to the ciliary escalator in the bronchial tubes Microbial Diseases of the Upper Respiratory System Learning Objective Differentiate pharyngitis, laryngitis, tonsillitis, sinusitis, and epiglottitis