TEST 3 PART 3

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Author:
rwischnewski
ID:
298564
Filename:
TEST 3 PART 3
Updated:
2015-03-16 20:36:28
Tags:
AP
Folders:
TEST 3
Description:
AP
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  1. how else does the chest size increase?
    the external intercoastals contract, pulling the ribs- which normally slant down- up to a more horizontal position.  This increases the front to the back chest volume.
  2. why does changes in chest volume cause changes in lung volume?
    The outer pleural layer is stuck to the inside of the chest wall, the inner pleural layer is stuck to the lung surface. Although the inner and outer layers are not psychically stuck together, the surface tension of the water in the pleural space holds them together, so when the chest wall moves out, the lung is pulled along with it.
  3. a quiet inhalation uses which muscles?
    diaphragm and external intercostals
  4. a quiet exhalation uses which muscles?
    none
  5. why does air move out of the lungs in exhalation?
    relaxing the inspiratory muscles allows the chest to return to its smaller size.  the decrease in volume causes an increase in pressure.  when the pressure rises above the air pressure, air moves out.
  6. a machine that measures the different amounts of air that the lung can move is called a _________.
    spirometer
  7. what is the tidal volume?
    the amount of air moved either into or out of the lung in a normal breath -- normally, 500cc
  8. what is vital capacity?
    the amount of air moved by a maximal inhalation followed by a maximal exhalation
  9. what is the residual volume?
    the amount of air that is left in the lungs following a maximal exhalation. there is always some air (about 1200 cc) left in the lungs, although the gases in this air constantly mix with the air that does move out of the lungs
  10. what is lung compliance?
    the ease with which the lungs can be inflated. lung tissue is filled with elastic fibers that stretch with inhalation and pull back with exhalation. diseases that damage the elastic fibers or form non-stretchable scar tissue decrease compliance
  11. what is partial pressure?
    the portion of the total atmospheric pressure that is caused by any one gas
  12. four gases make up practically 100% of the air. they are __________.
    nitrogen, oxygen, carbon dioxide, water vapor

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