L11- airway resistance Flashcards
1
Q
two things that makeup resistance to airflow
A
lung tissue viscous R and airway R
2
Q
how to measure airway R
A
(PB - PA) / V dot (air flow)
- PA measured with plethysmograph
- airflow with pneumotachometer
3
Q
sites of airway R
A
from the upper airways to generation 16 of bronchioles
- mainly in the conducting zone
4
Q
structure of trachea
A
- has ciliated epithelium and cartilage ring
5
Q
structure of bronchioles
A
- has SM and ciliated epithelium
- it varies in different bronchioles
6
Q
factors determining airway R
A
bronchodil or constriction
- airway SM tone so relaxation or contraction of bronchioles due to Ca in the muscle
- mucus build up so increases R
- lung vol - so radius increases then R decreases during ventilation
- n
7
Q
how to measure airway R changes
A
peak flow and spirometry
8
Q
factors determining peak expiratory flow
A
airway R and pressure gradient generation
