1. Respiratory System:
Outcome: I can describe the respiratory organs (structure) and their main function in the respiratory system.
Drill:
What is the function of the epiglottis

2. The Trachea and Bronchial Branches
Bronchioles (continued)
Two types
Terminal bronchioles (from tertiary bronchi)
Lead to pulmonary lobules (gas exchange)
Respiratory bronchioles (after terminal bronchioles)
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3. Cartilage LEFT LUNG Respiratory epithelium Smooth muscle 4
Overview of bronchi and bronchioles
Cartilage
LEFT LUNG
Left primary
bronchus
Secondary bronchus
Cartilage plates
Secondary
(superior
lobar)
bronchus
Visceral pleura
Tertiary bronchi
Bronchiole
Respiratory
epithelium
Smooth muscle
Bronchioles
Terminal bronchiole
Respiratory
bronchiole
Pulmonary lobule
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Figure 21.5 4

4. The Trachea and Bronchial Branches
Airflow and diameter changes
Trachea → primary bronchi → secondary bronchi → tertiary bronchi → bronchioles → terminal bronchioles → respiratory bronchioles → alveoli
Bronchi branch into smaller and smaller tubes
At each new branch, the diameter decreases
© 2015 Pearson Education, Inc.

5. Cartilage LEFT LUNG Respiratory epithelium Smooth muscle 4
Overview of bronchi and bronchioles
Cartilage
LEFT LUNG
Left primary
bronchus
Secondary bronchus
Cartilage plates
Secondary
(superior
lobar)
bronchus
Visceral pleura
Tertiary bronchi
Bronchiole
Respiratory
epithelium
Smooth muscle
Bronchioles
Terminal bronchiole
Respiratory
bronchiole
Pulmonary lobule
© Pearson Education, Inc.
Figure 21.5 4

6. Gross Anatomy of the Lungs
Gross anatomy of the lungs (continued)
Each lung is divided into lobes
The right lung has three lobes
Superior, middle, inferior
Divided by a horizontal and oblique fissure
The left lung has two lobes
Superior and inferior
Divided by oblique fissure
Also has an indentation in the medial margin called the cardiac notch
Each lung is surrounded by a pleural cavity
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7. Gross Anatomy of the Lungs
Gross anatomy of the lungs (continued)
Base
Inferior portion
Rests on the diaphragm
Apex
Superior pointed portion
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8. Lateral Surfaces Apex Apex Superior lobe Posterior Anterior Posterior
Features of the lateral surfaces of the lungs
Lateral Surfaces
Apex
Apex
Superior
lobe
Posterior
Anterior
Posterior
Superior lobe
Horizontal
fissure
Middle
lobe
Oblique
fissure
Oblique
fissure
Cardiac
notch
Inferior
lobe
Inferior
lobe
Base
Base
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Figure 21.6 3

9. Trachea Primary bronchus Secondary bronchus Tertiary bronchi Terminal
Continuous passageways of the respiratory tract
Trachea
Primary bronchus
Secondary bronchus
Tertiary bronchi
Terminal
bronchioles
Bronchioles
Broncho-
pulmonary
segment
Respiratory
bronchiole
Pulmonary
lobule
Alveoli
© Pearson Education, Inc.
Figure 21.7 1

10. Pulmonary Lobules Alveoli Supplied by an alveolar duct
Attached to a common chamber (alveolar sac)
Approximately 150 million/lung
Give the lungs an open, spongy appearance
Surrounded by extensive capillary network
Allows for gas exchange
Also surrounded by elastic fibers
Allow expansion and recoil with air movement in and out
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11. Describe the major differences between the left and right lung?
Respiratory System:
Exit Ticket:
Describe the major differences between the left and right lung?