Mechanics of breathing 2 Flashcards
1
Q
How can lung function be investigated?
A
- Airflow
- Lung volumes
- Ventilation
- Lung compliance
2
Q
What is lung volume?
A
Total volume of air an individual can breathe in or out
3
Q
What is ventilation?
A
Volume of air reaching respiratory surface over a given time
4
Q
What does ventilation depend on?
A
Depends on volume and rate of breathing
5
Q
What is lung compliance?
A
Force required to overcome recoil of lungs
6
Q
What is alveolar air a mixture of?
A
Mixture of fresh and stale air
7
Q
Steps involved in the removal and inhalation of air
A
- At the end of exhalation, dead space and alveoli are filled with stale air
- During inspiration, 500ml of fresh air is inhaled, but only 350ml reaches the alveoli
- At the end of inspiration, dead space is filled with fresh air
- During a 500ml expiration, volume of dead space is exhausted first
8
Q
What is (VT-VD) equal to?
A
Equal to the total volume of fresh air entering the alveoli in each breath
9
Q
Equation for minute volume
A
V=(VT-VD)xf
10
Q
What is VD?
A
Dead space volume(Volume of air remaining
