Question

The lungs expand in inspiration / inhalation due to

.Diaphragm contracts upward

.The volume of thoracic cavity increases

.External intercostal muscles relax

.Diaphragm relaxes​

Answer 1

Answer:

.Diaphragm contracts upward

. The volume of thoracic cavity increases

Explanation:

these both, the lungs expand in inspiration / inhalation.