Question

1. what two structures work together to change the volume of the chest during ventilation?

trachea and bronchi
alveoli and capillary
intercostal muscles and diaphragm

Explanation:

During ventilation (breathing), the intercostal muscles (between the ribs) and the diaphragm (a dome - shaped muscle at the base of the lungs) work together. When the intercostal muscles contract, they raise the ribs, and when the diaphragm contracts, it flattens. These actions increase the volume of the chest cavity. When they relax, the chest volume decreases. The trachea and bronchi are air - conducting tubes. Alveoli (air sacs) and capillaries are involved in gas exchange, not in changing chest volume.

Answer:

intercostal muscles and diaphragm