The Following Is a List of Some of the Structures

Multiple Choice

The following is a list of some of the structures of the respiratory tree: 1. secondary bronchi
2) bronchioles
3) alveolar ducts
4) primary bronchi
5) respiratory bronchioles
6) alveoli
7) terminal bronchioles
The order in which air passes through these structures beginning at the trachea is

A) 4, 1, 2, 7, 5, 3, 6.
B) 4, 1, 2, 5, 7, 3, 6.
C) 1, 4, 2, 5, 7, 3, 6.
D) 1, 4, 2, 7, 5, 3, 6.
E) 2, 4, 1, 7, 5, 3, 6.