Lung Flashcards
Tidal Volume (TV)
Normal breathing 500ml
- Controlled by pneumotaxic center
- Starts Herring breuer reflex
Inspiratory Reserve volume (IRV)
Forced inspiration 3000ml
- Apneustic center in pons–>turns off pneumotaxic
- Shuts down Herring breur reflex
Expiratory Reserve volume (ERV)
Forced expiration 1100ml
*controlled by rectus abdominus
Residual volume (RV)
Keeps lung from collapse 1200ml
Inspiratory capacity
IRV+TV=3500ml
Functional Residual capacity
ERV+RV=2300ml
Vital Capacity
IRV+TV=ERV=IC+RV=4600ml
Total Lung volume
IRV+ERV+TV+RV=5800ml
Dead space
air in pulmonary tree not involved with gas exchange
Respiration is controlled by what nerve?
Dorsal motor nucleus of Vagus (X)
Alveolar pressure
Slightly negative–>Normal quiet inspiration
Atmospheric pressure
opposes alveolar pressure
Pleural pressure
Negative pressure: Keeps lungs open. Pressure of fluid in space between lung pleura and chest wall
Transpulmonary pressure
Difference between alevolar pressure and pleural pressure.
*Elastic forces in the lung AKA RECOIL PRESSURE
Respiratory Distress Syndrome
Lack of surfactant at birth