Respiration I Flashcards
What is laminar flow
flow of a fluid when each particle follows a smooth path
What is flow type governed
determination of flow type
Describe the alveolar pressure during expiration
alveolar pressure is greater than atmospheric pressure
Under laminar conditions what is flow rate proportional to
the pressure gradient
Where does maximum rate of flow occur
centre of a tube
What is turbulent flow rate proportional to
square root of the pressure gradient/difference
TRUE or FALSE - in most places of the lung air flow is laminar
FALSE
What do you need to achieve a set flow rate under turbulent conditions
greater pressure gradient
Describe the relationship between flow rate and pressure under laminar conditions
positive linear correlation
Under what circumstances do eddies develop
when turbulent air hits branching points
Describe transitional flow
when air becomes turbulent then returns to being laminar
Where is cross sectional area of the airways high
respiratory zone
Why does the respiratory zone have high cross sectional area
branches
Describe the relationship between velocity and cross sectional area
velocity decreases as cross sectional area increases
What is the normal flow type at high velocity
turbulent
Name some factors reducing airway diameter
inflammation, increased mucous production, oedema
What is COPD
progressive lung diseases characterised by increased airway resistance and decreased airflow
Examples of COPD
Chronic bronchitis, emphysema
Describe chronic bronchitid
long term inflammation of bronchi and bronchioles
Describe emphysema
destruction of alveoli walls
True or False - There is a cure for emphysema
false
What are gluco-corticosteroids used for
reduce background inflammation and maintain decent air flow
Why do the airways become floppy in emphysema
loss of elastic nature
What can be used to manage COPD
gluco-corticosteroids, and bronchodilators
