Realistic models of the human respiratory system and 150 times magnified alveolus with blood vessels make great teaching and demonstration models, and are ideal for students, teachers, and medical professionals Regions depicted include the oronasal cavity, larynx and trachea, primary bronchi, and bronchial tree Upper respiratory section is medially sectioned so you can see interior anatomical details Labeled key anatomical features and accompanying key card make it easy to identify parts Comes mounted on a stand Constructed from durable PVC