The structure of the respiratory system that serves as the site of gas exchange is the
A)macrophage.
B)bronchi.
C)alveoli.
D)bronchiole.

Question

Quizplus · Accepted Answer

A)The alveoli comprise the terminal structures of the lower respiratory system. Alveoli serve as the sites of gas exchange, specifically, carbon dioxide and oxygen. Bronchi and bronchioles are larger structures in the respiratory system that serve as tracts for airflow. Macrophages are immune cells that keep the alveoli region free of microbes.
B)The alveoli comprise the terminal structures of the lower respiratory system. Alveoli serve as the sites of gas exchange, specifically, carbon dioxide and oxygen. Bronchi and bronchioles are larger structures in the respiratory system that serve as tracts for airflow. Macrophages are immune cells that keep the alveoli region free of microbes.
C)The alveoli comprise the terminal structures of the lower respiratory system. Alveoli serve as the sites of gas exchange, specifically, carbon dioxide and oxygen. Bronchi and bronchioles are larger structures in the respiratory system that serve as tracts for airflow. Macrophages are immune cells that keep the alveoli region free of microbes.
D)The alveoli comprise the terminal structures of the lower respiratory system. Alveoli serve as the sites of gas exchange, specifically, carbon dioxide and oxygen. Bronchi and bronchioles are larger structures in the respiratory system that serve as tracts for airflow. Macrophages are immune cells that keep the alveoli region free of microbes.

The Structure of the Respiratory System That Serves as the Site