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Air flows into the lungs because the diaphragm...

• relaxes

• contracts

Air flows into the lungs because the thoracic cavity...

• increases in volume
  

• decreases in volume

the volume that goes in and out during normal breathing

• vital capacity

• tidal volume

• total volume

• residual volume

can't be exhaled under normal breathing conditions

• vital capacity

• tidal volume

• total volume

• residual volume

maximum that can be inhaled during normal breathing

• expiratory reserve volume (ERV)

  
  

• inspiratory reserve volume (IRV)

  
  

maximum that can be exhaled during normal breathing

• expiratory reserve volume (ERV)

  
  

• inspiratory reserve volume (IRV)

  
  

is equal to vital capacity and residual volume

• total volume

  
  

• vital capacity

  
  

is equal to tidal volume and expiratory reserve volume and inspiratory reserve volume

• total volume

  
  

• vital capacity

  
  

When volume increases in the thoracic cavity, what happens to the pressure inside?

• it decreases

  
  

• it also increases

  
  

Which of the following is done passively (without expending energy)?

• inhaling during quiet breathing

  
  

• exhaling during quiet breathing

  
  

• inhaling during forced breathing

  
  

• exhaling during forced breathing