Which one of the following is a possibility for most of us in regard to breathing,by making a conscious effort?

  • A
    One can breathe out air totally without oxygen.
  • B
    One can breathe out air through Eustachian tube by closing both nose and mouth.
  • C
    One can consciously breathe in and breathe out by moving the diaphragm alone,without moving the ribs at all.
  • D
    The lungs can be made fully empty by forcefully breathing out all air from them.

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The lungs do not collapse during breathing and some air always remains in the lungs which can never be expelled because:

$A$ healthy human breathes $........$ times per minute.

Expiration occurs due to

On an average,a healthy human breathes $......$ times per minute.

Which muscles undergo contraction during normal expiration?

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