Which muscles could assist the diaphragm during inhalation to increase thoracic volume?
1. the rectus abdominus
2. the external obliques
3. the internal intercostals
4. the external intercostals

3.the internal intercostalas

Explanation:

the intercostals muscles assist the diaphragm during inhalation to increase thoracic volume for this we have to know about intercostals muscles the intercostals muscles relax returning the chest wall to its original position due to this the pressure inside the thoracic cavity is increases to a large extent  which is very high compared to the normal pressure

probably since the potency of the cocaine, not a lot, but i've never done any research on cocaine so i wouldn't know, but i would also guess it would determine on the gap between sniffs or if you did it all at once, so i really don't know.

Ok, so is their any answer that we can pick?

Explanation: