Upon starting an exercise class you are instructed to take your biggest expiration of the day so far. For this to happen select what factors will increase, decrease, or stay the same during the expiration:
1. increase
2. decreases
3. does not change
__ vital capacity
__ contraction of external intercostal muscles
__ alveolar pressure
__ lung volume
__ atmospheric pressure
__ intrapleural pressure
__ contraction of the diaphragm
__ contraction of internal intercostal muscles
Increases __ vital capacity.
Decreases during expiration when external intercostal muscles relax. __ contraction of external intercostal muscles.
Increases __ alveolar pressure.
Decreases __ lung volume.
No change __ atmospheric pressure.
No change __ intrapleural pressure.
Does not happen __ contraction of the diaphragm.
Increased or occur __ contraction of internal intercostal muscles.
VC is the measure of maximum amount of air inhaled or exhaled during a respiratory cycle. Relaxation of external intercostal muscles occur during expiration associated with contraction of internal intercostal muscles which decreases the lung volume. Increase in alveolar pressure than the atmospheric pressure pushes the air put of the lungs during expiration.
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