Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Respiratory System > Lung Mechanics and Ventilation > Flashcards

Lung Mechanics and Ventilation Flashcards

1
Q

What is ventilation?

A

The process of inspiration and expiration

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

What is quiet inspiration?

A

Normal breathing in without any additional effort

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

What happens in quiet inspiration?

A

Active expansion of thoracic cavity
Lung volume increases
Pressure falls
External intercostals contract

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

What is quiet expiration?

A

Normal breathing out without any additional effort

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

What happens in quiet expiration?

A 
Passive expulsion of air
Relaxation of muscles
Elastic fibres recoil 
Reduces volume of lungs 
Pressure increases
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is Boyle’s law?

A

Inverse relationship between pressure and volume of a gas

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

What keeps the lungs against the chest wall?

A

Pleural fluid between the pleura forms a seal between lungs and thoracic wall

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

What is between quiet inspiration and quiet expiration?

A

The resting expiratory level

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

What happens at the resting expiratory level?

A

Lungs are pulled in and up - elasticity
Chest wall pulled out - elasticity
Diaphragm pulled down - passive stretch

Forces are equal and opposite to no movement of chest wall

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

Is inspiration active or passive?

A

Active

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

Is expiration active or passive?

A

Passive

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

What is the pressure in the intrapleural space?

A

Negative - relative to atmospheric pressure

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

Why is intrapleural pressure negative?

A

Elastic recoil of lung pulls visceral pleura inwards + elastic recoil of chest wall pulls parietal pleura outwards

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

What happens if the pleural seal is broken?

A

Negative pressure in intrapleural space draws air into space - collapses the lung

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

What is tidal volume?

A

Volume of air entering and leaving the lungs in a single breath

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which muscles are used in forced inspiration?

A

SCM
Scalene muscles
Serratus anterior
Pec major

17
Q

What muscles are used in forced expiration?

A

Internal intercostals

Abdominal wall muscles

18
Q

What is lung compliance?

A

‘Stretchiness’ of the lungs

19
Q

What determines lung compliance?

A

Elastic tissue in lungs

Surface tension of alveoli lining

20
Q

What is the effect of fluid lining the alveoli?

A

The surface tension of the fluid makes it difficult for alveoli to expand - decreases compliance

21
Q

What is the effect of surfactant?

A

Breaks up H2O molecules and disrupts interaction between fluid molcules - reduces surface tension

22
Q

What cells produce surfactant?

A

Type 2 pneumocytes

Respiratory System (23 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions