Bronchi and Lungs (14) Flashcards
The two main (primary) bronchi are
Branches of the trachea in the mediastinum
Difference between the left main bronchi and the right main bronchi
Right is wider, shorter, and more vertical
Left is longer, narrower, and more horizontal
How many secondary (lobar) bronchi on the right
3
How many secondary (lobar) bronchi on the left
2
What does the secondary bronchi supply
Each supplies a lobe of the lung
The secondary bronchi branch into
Tertiary (segmental) bronchi
Tertiary (segmental) bronchi branch into
Each lung segment
10 in right, 8-10 in left
How many orders of air tubes are in the lungs
23 (20-25)
What are bronchioles
Little bronchi <1 mm in diameter w/o cartilage
Size of terminal bronchioles
<0.5 mm in diameter
As the conducting tubes become smaller, how does the supportive connect tissue change
Cartilage rings replaced by irregular plates of cartilage
Supportive cartilage no longer present by bronchioles lvl
How does the epithelium change
Thins; pseudostratified columnar -> simple columnar -> simple cubodial
Does small bronchioles have cilia or mucus producing cells
No
How does airway widen
Sympathetic stimulation of smooth muscle
How does airway constrict
Parasympathetic stimulation of smooth muscle
What is the respiratory zone
End part of the respiratory tree in the lungs
Respiratory bronchioles branched off from
Terminal bronchioles
Respiratory bronchioles lead into
Alveolar ducts
Alveolar ducts lead into
Alveolar sacs, clusters of alveoli
Gas exchange happens in
Alveoli
Amount of alveoli
400 million
Surface area of alveoli
1500 square feet / 140 square meters
Respiratory membrane consist of
Alveolar, capillary walls, fused basal laminae
Properties of respiratory membrane
Thin, delicate, 0.4 um
