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Flashcards in Respiratory System Deck (14):
1

What is the role of surfactant?

Reduces surface tension of water molecules lining alveoli. Allows them to stay inflated?

2

What is dynamic airway compression?

?

3

What do our airways do to air?

-Moisten to saturation
-Heated
-Cleaned/Filtered by cilia and/or mucus (mucociliary escalator)

4

Describe the setup of alveoli and pulmonary capillaries.

-Capillaries are like grapes, not soap bubbles; share walls.
-Capillaries are in close contact with alveoli and coat them in a thin layer of blood.

5

What are type 1 cells?

-Squamous epithelial cells

6

What are type 2 cells?

-Fewer in number than type one cells; create surfactant.

7

What is a main reason that inspiration at rest should be easy?

-Only small pressure changes are needed for inspiration/expiration

8

At what point in development does surfactant start being produced?

-28 weeks.

9

What is the role of surfactant in the lungs?

-Reduce surface tension of water molecules lining alveoli.

10

What is accomplished by having small airways tethered to surrounding alveoli?

-airway diameter increases at large lung volumes.
-higher expiratory flow rates can be achieved at higher volumes.

11

What are some causes of bronchiolar constriction?

-Histamines
-Parasympathetic nervous stimulation
-decreased partial pressure of CO2
-expiration

12

What are some causes of bronchiolar dilation?

-epinephrine and B2 stimulators
-increased partial pressure of CO2
-Inspiration

13

What does O2 impact via dilation?

Blood vessels

14

What does CO2 impact via dilation?

Bronchioles