When Abby Ellstrom and her friends at East High School in Denver crave classic chicken nuggets for lunch, the sophomores swipe the Uber icon on one of their smartphones and ride the nine blocks to Chick-fil-A.When they are done, they click Uber again for pickupâand make it back in time for their next class.y. When Abby Ellstrom and her friends at East High School in Denver crave classic chicken nuggets for lunch, the sophomores swipe the Uber icon on one of their smartphones and ride the nine blocks to Chick-fil-A. When they are done, they click Uber again for pickupâand make it back in time for their next class.
Trachea and Bronchi. The respiratory tree (figure 7-4) is the set of tubular structures which carry the air from the larynx to the alveoli of the lungs. Looking at a person UPSIDE DOWN, the trachea is the trunk of the tree and the bronchi are the branches. These tubular parts are held open (made patent) by rings of cartilage. Their lining is ciliated to remove mucus and other materials that get into the passageway.
Larynx, also called voice box, a hollow, tubular structure connected to the top of the windpipe (trachea); air passes through the larynx on its way to the lungs. The larynx also produces vocal sounds and prevents the passage of food and other foreign particles into the lower respiratory tracts. The larynx is composed of an external skeleton of cartilage plates that prevents collapse of the structure. The plates are fastened together by membranes and muscle fibres.