Lecture 3 Flashcards

1
Q

Breath

A

Inspiration and subsequent exhalation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Airflow

A

rate at which gas moves; varies b/w species; results from thoracic volume increasing, making pleural pressure more negative and pressure gradient drives air into the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Flow of airflow stops when

A

volume is at a greater level at rest; pleural pressure is more negative and alveolar pressure is 0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Inflation

A

resistance of airflow makes pleural pressure more negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

End of Inspiration

A

pleural pressure is more negative than at rest due to stretch of the lungs by increasing volume and the lungs want to collapse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Pressure increases as…

A

volume increases and lungs want to collapse more

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Compliance

A

measure of strech-ability of the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

2 major collapsing forces of the lungs

A

lung elastic recoil

surface tension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Surface Tension

A

force that acts at as gas-liquid interface which reduces the surface area of the interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Air surrounded by liquid

A

surface tension acts to reduce area of air-liquid interface by collapsing the air bubble (pressure in air bubble counteracts the collapsing force)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Laplace Law

A

describes pressure required to keep bubble open; smaller radius and greater pressure required
P= 2t(surface tension)/r

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Surfactant

A

substance that works to reduce air-liquid interface surface tension; produced by type 2 alveolar cells; keeps lung DRY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

AS lung expands

A

surfacant layer thins and surface tension increases, greater collapsing force with increasing lug expansion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

AS lung deflates

A

surfactant layer thickens and surface tension decreases- preventing collapse of the alveoli at low lung volumes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Consequences of surfactant insufficiency

A

lungs cant expand easily, muscles work harder
small alveoli collapse into larger alveoli
transduction of fluid into alveoli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly