Term
Lung Volume During a Respiratory Cycle: Static Lung Volume Dynamic Lung Volume 

Definition
Static Lung Volume 3.2 Liters Dynamic Lung Volume 3.7 Liters
Static Lung fully filled until expiration, and the dynamic lung volume decreases to 3.2 liters 


Term
Lung Pressure Intrapleural Pressure (Static > Dynamic > Static) Transpulmonary Pressure (Static > Dynamic > Static) 

Definition
Intrapleural Pressure: At around 5 cmH2O at empty static lung Decreases to 7.5 and stays there until the second static state *Decreases at inspiration, increases at expiration
Transpulmonary Pressure: Same as Pip, but more gradual and linear so that 1/2 full lung is 1/2 down the curve, not all the way down the curve. 


Term
Alveolar Pressure During Respiratory Cycle 

Definition
0 unders static conditions During inspiration, rapidly becomes negative, then back to 0 by the end of inspiration During expiration, rapidly becomes positive, then back to 0 by the end of expiration 


Term
Airflow (V with dot) During Respiratory Cycle 

Definition
0 under static conditions during inspiration, rapidly becomes negative then back to 0 by the end of inspiration during expiration, rapidly becomes positive then 0 by the end of expiration 


Term
2 Effects of Negative Transpulmonary Pressure during inspiration 

Definition
1) Body invests energy into making P(a) more negative, resulting in air flowing into the lungs, making lung volume greater. 2) Body invests a greater fraction of energy into making Transpulmonary Pressure more positive, thereby maintaining a higher lung volume. *Body has now used all energy from the change in Pip (transpulmonary pressure) and no longer expands 


Term
Effect of Airway Resistance on the Rate of Lung Inflation 

Definition
time constant is a measure of how long it takes to fill the lungs to 63% capacity healthy lungs .2 seconds diseased lungs 1 second So, obviously, increased resistance (whether it be by restriction or obstruction) slows airflow 


Term
Effect of Airway Resistance on Tidal Volume 

Definition
Healthy lungs lung volume remains relatively steady at increasing frequencies (respiratory cycles/second) Diseased Lung Lung volume decreases at a low respiratory frequency and continues to decrease with increasing respiratory frequencies 


Term
Effect of Respiratory Frequency on Tidal Volume 

Definition
Change in lung volume decreases as respiratory frequency increases *makes senseshort frequent breaths leads to a decrease in the change of lung volume over each respiratory cycle 


Term

Definition
V (with dot) = P(b)  (P(a)/R(aw)) 


Term
Equation for Airway Resistance (R(aw)) 

Definition
R(aw)= P(a)  (P(b)/V(with dot)) 

