Ventilation Part 1.txt
Card Set Information
Ventilation Part 1.txt
The process of moving air in and out of the lungs
What is the main function of the lungs?
to supply O2 to the body and remove CO2.
Inadequate ventilation or increased work of breathing can result from?
Disease or unhealthy lung
Normal ventilation is a cyclical activity of ?
inspiration and expirattion phases.
During normal ventilation the ______ removes CO2 and supplies O2 to meet the metabolic needs.
Tidal Vomlume (Vt)
The reserve to meet increased ventilatory demands, such as from exercise comes from?
insiratory reserve volume and expiratory reserve volume.
inspiratory reserve volume
expiratory reserve volume
Comprise the vital capacity
IRV and ERV
Ventilation can be related to the following equation of motion for the Resp. Sys.
Pressure= (Volume/Compliance)+(resistance x Flow)
= Force generated by the respiratory muscles during inspiration
= Volume change (VT)
= Distensibility of the lungs and thorax
= Airflow and tissure resistance
= Volume change per unit of time
Compliance and resistance of the lungs and thorax make up the work load of?
In healthy lungs, this work is performed during?
Ventilation occurs because of pressure gradients created by?
expansion and contraction of the thorax
Pressures are usually measure in?
1 atm in cm H2O
1 atm in mmHg
A possitive pressure is?
greater than atm.
negative pressure is?
less than 1atm
difference between two pressures is called?
Important pressure gradients
Transrespiratory, transpulmonary, and transthoracic
this gradient pressure causes gas flow in and out of the lungs
Formula of Prs
Is the difference between alveoli pressure and pleural pressure
(Ptp or PL
Equation for transpulmonary pressure
PL keeps what open
Difference between pleural pressure and body surface pressure. Represents total pressure required to expand or contract the lungs and chest wall together
Pw the pressure across the chest wall
Body surface pressure
Formula for transthoracic pressure
Distention of the lungs are needed for?
These are the forces opposing lung inflation.
Elastic and frictional forces
oppsing forces that involve the tissues of lungs and thorax, and surface tension in the alveoli
resistance caused by gas flow and tissue movement during breathing. An opposing force on inflation of the lungs
What are the four lung volumes
Tidal volume, Inspiratory reserve volume, expiratory reserve volume, residual volume
Four lung capacities
Inspiratory capacity, vital capacity, functional residual capacity, total lung capacity.
the volume of gas that is inhaled or exhaled from the lungs during quiet breathing. ~500mls
The maximum volume of gas that can be inhaled following a normal quiet breathing
Inspiratory reserve volume ~ 3100mls
the amount of gas that can be exhaled from the lungs following normal quiet exhalation ~1200mls
Expiratory reserve volume
The volume of gas remaining in the lungs after a complete exhalation ~1200mls
The maximum amount of gas that can be inhaled following a normal quiet exhalation. Sum of tidal volume and inspiratory reserve volume. ~3600mls
the maximum amount of gas that can be exhaled following a maximum inhalation of gas. Sum of inspiratory reserve volume, tidal volume, and the expiratory reserve volume. ~4800mls
the amount of gas left in the lungs following a normal quiet exhalation. Sum of residual volume and expiratory volume. ~2400mls
Functional residual capacity
the maximum volume of gas in the lungs at the end of a maximum inhalation. sum of the vital capacity and the residual volume
total lung capacity