Question

the gas exchange of oxygen to the bloodstream takes place in what part of the respiratory system?(1 point)○ pharynx○ bronchiole○ alveoli○ trachea

Explanation:

The pharynx, bronchiole, and trachea function as passageways for air in the respiratory system, but actual gas exchange (oxygen entering the bloodstream, carbon dioxide exiting) occurs in the tiny, thin-walled air sacs called alveoli, which have direct contact with blood capillaries.

Answer:

alveoli