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Respiratory System

Conducts air in and out of lungs, Humidifies air, Warms air, Filters air.

Pulmonary Respiration

exchange of O2 and CO2 between the alveoli and circulating blood in the pulmonary capillaries.

Cellular Respiration

Relates to 02 utilization and C02 production by the tissues


lungs containe over 300 million tiny air sacs providing a huge surface area for gas exchange (Diffusion).


an active process in which the intercostal (rib) muscles and the diaphragm contract, expanding the size of the chest cavity and causing air to flow into the lungs


muscular partition that separates the thoracic cavity from the abdominal cavity and aids in respiration by moving up and down


diaphragm relaxes & moves up into original dome shape. This decreases the chest volume & moves air out of the lungs


Respiratory process by which gases are moved into and out of the lungs.


the process by which molecules spread from areas of high concentratiion, to areas of low concentration

Resistance to Airflow

-pressure is one determinant of airflow
-resistance is the other determinant of airflow
-the greater the resistance the slower the flow

Pulmonary Ventilation


Vital capacity

the maximum amount of air that can be exhaled after a maximum inhalation (usually tested with a spirometer)

Residual Volume

The amount of air that remains in the lungs after forcefully exhaling.

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