Flashcards in Respiratory System Deck (14):
What is the role of surfactant?
Reduces surface tension of water molecules lining alveoli. Allows them to stay inflated?
What is dynamic airway compression?
What do our airways do to air?
-Moisten to saturation
-Cleaned/Filtered by cilia and/or mucus (mucociliary escalator)
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.
What are type 1 cells?
-Squamous epithelial cells
What are type 2 cells?
-Fewer in number than type one cells; create surfactant.
What is a main reason that inspiration at rest should be easy?
-Only small pressure changes are needed for inspiration/expiration
At what point in development does surfactant start being produced?
What is the role of surfactant in the lungs?
-Reduce surface tension of water molecules lining alveoli.
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.
What are some causes of bronchiolar constriction?
-Parasympathetic nervous stimulation
-decreased partial pressure of CO2
What are some causes of bronchiolar dilation?
-epinephrine and B2 stimulators
-increased partial pressure of CO2
What does O2 impact via dilation?