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.
The lungs are made up of a series of dividing airways called bronchi that lead to clusters of alveoli. The lungs can be imagined as an upside down tree where the branches are the bronchi and alveoli are like clusters of grapes at the ends of the branches. In the alveoli, oxygen and carbon dioxide are exchanged to and from red blood cells in the blood stream. The trachea, which is the largest airway, connects the lungs to the outside world. The lungs are separated into five segments called lobes (three on the right and two on the left).