Question

elevation of the ribs increases thoracic cavity...
multiple choice
pressure
length
depth
width

Explanation:

When the ribs are elevated, the movement causes an increase in the width of the thoracic cavity. This is a key aspect of the mechanics of breathing. Pressure is inversely related to volume (Boyle's Law), so an increase in volume (due to increased width) would lead to a decrease in pressure (not an increase). Length and depth are not the primary dimensions affected by rib elevation in the context of thoracic cavity changes related to normal breathing mechanics.

Answer:

Width