What structural changes occur from primary bronchi to terminal bronchioles? (1) The mucous membrane.

What structural changes occur from primary bronchi to terminal bronchioles? (1) The mucous membrane changes from pseudostratified ciliated columnar epithelium to nonciliated simple cuboidal epithelium. (2) The number of goblet cells increases. (3) The amount of smooth muscle increases. (4) Incomplete rings of cartilage disappear. (5) The amount of branching decreases. (a) 1, 2, 3, 4, and 5 (b) 2, 3, and 4 (c) 1, 3, and 4 (d) 1, 3, 4, and 5 (e) 1, 2, 3, and 4

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