To produce the pressure gradient responsible for inspiration, thoracic volume must first increase in order to decrease intrapulmonary pressure relative to atmospheric pressure. True or False

The answer for this is true.

Explanation:

The answer for this one is not false because the statement given is true as the thoracic volume  is directly proportional to the intrapulmonary pressure relative  to atmospheric pressure that is why thorcic volume firstly rising only so that intrapulmonary pressure reduces.

so according to this the statement provided in the question is true that is why we said that our answer is true.

d. air pressure decreases as altitude increases.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this