Trachea - Bronchial tree

Trachea
-windpipe
-larynx at division forming
two primary bronchi at midthorax
-mucosa –
pseudostratified 
epithelium (goblet cells)
-submucosa –
connective tissue
seromucous glands –
mucous -advantitia –
CT hyaline cartilage

Bronchial tree

-left and right primary bronchi
-formed by divisions of the  trachea
-secondary bronchi (lobar)
-inside the lungs
-3 on the right
-2 on the left
-tertiary bronchi (segmental)
-fourth-order
-fifth-order
-23 orders of branching air ways
-bronchioles (under 1 mm in diameter

Cartilage:

-rings
-irregular plates
-no cartilage in bronchioles
-replaced by elastic fibers

Epithelium:
-pseudostratified (ciliated)
-columnar (ciliated)
-cuboidal in terminal bronchioles (no cilia)
Smooth Muscle:
-increases as tubes get smaller

Human Anatomy and Physiology
The respiratory zone
Respiratory Zone:
Respiratory bronchioiles
Alveoli (300 million)
Alveolar ducts
Alveolar sacs

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