science education resource

For K-12 Students • Educators • Homeschool Families • Naturalists

Functional Parts of the Respiratory System

Every cell in the body must have oxygen at all times to survive. The cells must also get rid of their carbon dioxide waste. That is the job of the respiratory system.

There are four functional parts to respiration.
1) Pulmonary Ventilation – Bringing oxygen into the lungs and carbon dioxide out of the lungs.

2) Transport of Respiratory Gases – Moving oxygen through the bloodstream from the lungs to all the cells of the body and carbon dioxide from the cells back to the lungs.

3) External Respiration – Exchanging oxygen for carbon dioxide in the capillaries lining the tiny alveoli inside the lungs.

4) Internal Respiration – Exchanging oxygen for carbon dioxide from the capillaries across to the cells.

Functional Parts of the Respiratory System

Citing Research References

When you research information you must cite the reference. Citing for websites is different from citing from books, magazines and periodicals. The style of citing shown here is from the MLA Style Citations (Modern Language Association).

When citing a WEBSITE the general format is as follows.
Author Last Name, First Name(s). "Title: Subtitle of Part of Web Page, if appropriate." Title: Subtitle: Section of Page if appropriate. Sponsoring/Publishing Agency, If Given. Additional significant descriptive information. Date of Electronic Publication or other Date, such as Last Updated. Day Month Year of access < URL >.

Here is an example of citing this page:

Amsel, Sheri. "Functional Parts of the Respiratory System" Exploring Nature Educational Resource ©2005-2021. January 16, 2021
< > has more than 2,000 illustrated animals. Read about them, color them, label them, learn to draw them.