Given what we know, we can confirm that the diaphragm contracting downward into the abdomen and the expansion of the intercostal muscles are both processes of inhalation.
How do these help inhalation?
The diaphragm is the main muscle in charge of inhalation. The intercostal muscles are considered accessory muscles for this process. The expansion of both of these muscles serve to reduce the internal air pressure of the lungs, thus causing air to be pulled in.
Therefore, we can confirm that the diaphragm contracting downward into the abdomen and the expansion of the intercostal muscles are both processes of inhalation.
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