Air pressure is lowest in the lungs during which of the following points during inspiration or expiration?

Question

Air pressure is lowest in the lungs during which of the following points during inspiration or expiration?

A	End of inspiration, when lung volume is lowest
B	End of inspiration, when lung volume is highest
C	End of expiration, when lung volume is lowest
D	End of expiration, when lung volume is highest

Answer 1

When temperature and moles of a gas are constant, pressure and volume are inversely related so the correct answer would be C. This makes sense becomes inhalation requires a negative pressure (less than atmospheric pressure).

Answer 2

Humans and other mammals breath via negative pressure. In other words, as we mechanically expand our lungs during inspiration we create (within our lungs) a region of negative pressure that sucks air into them. Once the lungs are full of air at the end of inspiration the pressure in them has equalized to atmospheric pressure. Then during expiration we relax our diaphragm and our chest/lungs mechanically collapse pushing air out.

I don't particularly like the way any of the answers are written but I would mark "B - End of inspiration, when lung volume is highest"