Question

during inhalation, the diaphragm and intercostal muscles ____, which ____ pressure in the thoracic cavity, and air flows into the body. relax increases contract increases contract decreases relax decreases

Explanation:

During inhalation, the diaphragm and intercostal muscles contract. This increases the volume of the thoracic cavity. According to Boyle's law, an increase in volume leads to a decrease in pressure. So, the pressure in the thoracic cavity decreases, causing air to flow into the body.

Answer:

contract decreases