Answer:
The prime mover for inhalation, or the process of breathing in, is the diaphragm. The diaphragm is a dome-shaped muscle located at the base of the lungs and separating the thoracic cavity from the abdominal cavity. When it contracts, it flattens, causing the volume of the thoracic cavity to increase. This expansion of the thoracic cavity lowers the air pressure inside the lungs, allowing air to flow into the lungs from the outside, which is the process of inhalation.
Step-by-step explanation: