Phys 1 Respiratory cycle Flashcards
Muscles of inspiration?
- DIaphragm
- external intercostal muscles
- scalene
- sternomastoids
- additional head and neck muscles
The diaphragm
Innervation?
Action?
result?
External intercostal ms
location?
action?
how do they run?
increase what?
Scalene?
when is it used?
action?
sternomasoids
when used?
action?
First step of inspiration?
what does this accomplish?
Are lungs and muscles attached to each other?
What connects the visceral and parietal pleura?
Intrapleural pressure
at rest?
Events in inspiration
as the thorax increases in volume what happens?
Events in inspiration
drop in intrapleural pressure as the thorax expands what happens?
Events in inspiration
when the lungs increase in size what happens?
events in inspiration
what happens with alveolar pressure drop?
how far does it have to drop?
What do typical graphs show?
is inspiratory airflow positive or negative?
Inspiration
Volume change?
Alveolar pressure?
intrapleural pressure?
Airflow?
What is the amount of air inhaled in a given breath known as?
what is a normal breath?
what is its abbreviation?
Tidal Volume
(VT)
usually around 500 mL
Expiratory muscles
What do these muscles cause?
Events in expiration
From the end of inspiration?
Events in expiration
once the diaphragm and rib cage are back to their original postions?
The decreasing volume causes the intrapleural pressure to return to its starting point
What happens to alveoli when rib cage decreases volume?
The respiratory cycle expiration
what happens to volume?
Alveolar pressure?
Intrapleural pressure?
Air Flow?
- There is now a pressure gradient producing airflow OUT of the lungs
- the volume in the lung decreases
intrapleural vs alveolar pressures
at rest?
with inspiration?
Where is the peak?
With expiration?
Where is the peak?
What is Minute ventilation?
Alveolar ventilation
How to calculate anatomic dead space?
estimated by patients weight in pounds
150lbs = 150 mL
339lbs = 339 mL
Minute alveolar ventilation
