Question

what happens to the pressure inside the thoracic cavity when the diaphargm contracts? what effects does this have on the lungs?

Answer 1

When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.