Arrange the following events in the order as they occur during inspiration:
1. air flows into the lungs
2. alveolar volume increases
3. thoracic volume increases
4. pleural pressure decreases
5. alveolar pressure decreases
a. 1,2,3,4,5
b. 2,5,1,3,4
c. 3,4,2,5,1
d. 4,5,2,1,3
e. 5,1,3,4,2
Answer: C