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Processes of Breathing

Explore how the oxygen in a breath of air travels through the lungs and into the circulatory system.

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Processes of Breathing

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(plural, alveoli): Tiny sac at the end of bronchioles in the lungs where pulmonary gas exchange takes place.


(singular, bronchus): A passage of airway in the respiratory tract that conducts air into the lungs; branches into smaller tubes, which become bronchioles.


Branches of the bronchi; terminate by entering the alveoli.


(plural, cilia): Short, hairlike projection, similar to flagellum, that allows some cells to move.


A flap of connective tissue that closes when food is swallowed to prevent choking.

peripheral capillaries

Capillaries that supply body tissues with blood.

peripheral gas exchange

The exchange of gases between blood and body cells.


Long, tubular organ that connects the mouth and nasal cavity with the larynx through which air and food pass.

pulmonary gas exchange

The exchange of gases between inhaled air and the blood.


Long, tubular organ of the respiratory system, also called the wind pipe, that carries air between the larynx and lungs.


Process of carrying air from the atmosphere into the lungs.

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