$I.$ Intra-pulmonary pressure remains less than the atmospheric pressure.
$II.$ There is negative pressure in the lungs compared to the atmospheric pressure.
In which of the above two situations does inspiration take place? Choose the correct option.

  • A
    Only $I$
  • B
    Only $II$
  • C
    Both $I$ and $II$
  • D
    $I$ or $II$

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