Rate of breathing is controlled mainly by ------

Options :
  1. pH in blood
  2. carbon dioxide concentration in venous blood
  3. oxygen concentration in arterial blood
  4. all of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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All of them, all except Phineas, constructed at infinite cost to themselves these Maginot Lines against this enemy they thought they saw across the frontier, this enemy who never attacked that way-if he ever attacked at all if he was indeed the enemy.
-John Knowles A Separate Peace