The Respiratory System (Pt. 2) Flashcards
The narrow superior portion of each lung
Apex
What is the apex located deep to?
The clavicle
The base of the lungs, which are the broad lower portion, rest on the?
Diaphragm
Divide each lung into lobes
Fissures
The left lung has __ lobes, the right lung has __ lobes (2)
- 2
- 3
After the primary bronchi enter the lungs, the subdivide into smaller and smaller __ and finally end in the smallest of the conducting passageways, the __ (2)
- Branches
- Bronchioles
All but the smallest branches have reinforcing what in their walls?
Cartilage
The bronchioles lead into smaller conduits and eventually end in the __
Alveoli
Air sacs surrounded by the capilarry blood vessels for the exchange of gases, “small cavity”
Alveoli
The only sites of gas exchange include: (4)
- Respiratory bronchioles
- Alveolar ducts
- Alveolar sacs
- Alveoli
Respiratory bronchioles, alveolar ducts, alveolar sacs, alveoli are:
The only site of gas exchange
Air must move into and out of the lungs so that the gases in the alveoli of the lungs are continuously changed and refreshed
Pulmonary ventilation
The process of pulmonary ventilation is commonly called?
Breathing
When air is flowing into the lungs
inspiration
When air is leaving the lungs
Expiration
What are the inspiratory muscles? (2)
- Diaphragm
- External intercostals
When the inspiratory muscles contract, the size of the __ cavity __ (2)
- Thoracic cavity
- Increases
The volume within the lungs is called?
Intrapulmonary volume
As the intrapulmonary volume increases, the gases within the lungs __ out to fill the larger __
- Spread
- Space
This causes the gases to flow out to __ the pressure inside and outside the lungs
Equalize
What is the pressure within the pleural space called?
Intrapleural pressure
The intrapleural pressure is always __ , this is the major factor preventing the __ of the lungs
- Negative
- Collapse
