Question

lo 4.4. what is residual volume?
amount of air that remains in the lungs after a forceful exhale
amount of air that remains in the bronchi after a forceful exhale
amount of air that remains in the throat after a forceful exhale
amount of air that remains in the nasal cavity after a forceful exhale
amount of air that remains in the trachea after a forceful exhale

Explanation:

Residual volume is a term related to the respiratory system. It specifically refers to the air that remains in the lungs even after a forceful exhalation. This is important for maintaining lung function and preventing the alveoli (air - sacs in the lungs) from collapsing. The other options mention structures like bronchi, throat, nasal cavity, and trachea. While these are parts of the respiratory tract, residual volume is defined in the context of the lungs.

Answer:

Amount of air that remains in the lungs after a forceful exhale