Inspiration is initiated by -------

Options :
  1. extension of the lungs
  2. extension of the diaphragm
  3. contraction of diaphragm
  4. all of the above
Answer and Explanation :-

Answer: Option 3

Explanation:

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He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish no matter which is true, he is certainly an unhappy man, for he has put a knife in the heart of wonder.
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