Module 10 ML-4 Flashcards
What are the 5 steps of respiration
ventilation, exchange, transport, exchange, cellular respiration
What is between the lung and the chest wall
intrapleural space
Inspiration
Chest wall pulls out and lungs pull out
-pressure in lungs drops
-Palv<Patm
Expiration
chest wall goes inward and volume in lung decreases
- Palv> Patm
What pressure stays constant and what pressure changes
atm pressure stays constant and alv pressure changes due to the dimensions of the chest wall and lungs
Boyle’s Law
at a constant pressure, the pressure of a fixed number of gas molecules is inversly proportional to the volume of the container
More collisions=
more pressure due to a decreased volume size
What is the main inhalation muscle?
diaphragm
What muscles are recruited for deeper inhalation
sternocleidomastoid and scalenes
What muscles are recruited for deeper exhalation
internal intercostals and abdominal muscles
If not attached to anything what would the chest wall want to do
expand upward and outward by elastic recoil
How is the chest wall held inward and downward?
by attachement to partieal wall of pleural sac, transmural pressure gradients and surface tension
If lungs not attached to anything what would they want to do
lungs would want to collapse inward due to their elastic recoil
How are the lungs pulled open
attachment to visceral wal of plueural sac
In between breaths what are the pressure of the atmosphere and the lungs
they are equal
Intrapleural pressure is below what
atmospheric and alveoli pressure
What is the intrapleural pressure
-4 because it is getting pulled in opposite directions and increased the space which decreases the pressure
Transpulomnary pressure
Palv-pip
Chest wall
Pip-Patm
FRC functional residual capacity
the volume of air remaining in the lungs at the end of a quiet exhale when respiratory muscles are relaxed
At FRC what is equal
outward recoil of chest wall and inward recoil of the lung and
alevolar pressure = atmospheric pressure but there is no movement of ait
If transpulomnary pressure is positive what does that mean
lungs are being held open and are not collasping
What are the normal values at FRC
Pip=-4
Ptp=4
Patm and alv=0
