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Question -

Explain the process of inspiration under normal conditions.



Answer -

  1. Inspiration occurs when pressure within lungs is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure.
  2. Inspiration is initiated by the contraction of diaphram which increases the volume of thoracic chamber in the antero-posterior axis.
  3. The contraction of external inter-costal muscles lifts up the ribs and the sternum causing an increase in the volume of a thoracic chamber in the dorso- ventral axis.
  4. The overall increase in thoracic volume causes a similar increase in pulmonary volume.
  5. An increase in pulmonary volume decreases the intra pulmonary pressure, to less than atmospheric pressure which forces the air from outside to move into the lungs i.e., inspiration.

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