The Oxygen Molecule
What is Respiration?

Basically, Cellular Respiration happens when food molecules filled with energy are broken down into H2O, O2, and CO2.
Cellular Respiration is when a living thing releases the energy in food molecules. When you breathe, you breathe in, you are breathing oxygen (o2) when you exhale, and you are releasing carbon dioxide (co2).

Where does Respiration Happen?

In a single celled organism of the exchange o2 and co2 happens on the cells membrane (flesh). Larger animals with multicellular bodies like birds and Homo sapiens respiration is much more complex and usually includes a part of the body or organ that is suited for this.
The Lungs

Respiration Broken Down

Electrons from the food molecules are extracted and moved around, finally the electrons reach o2.If O2 accepts the electron, it turns into water, one of the waste products in respiration.
Parts of the respiratory system are used for different things. Some, parts filter the bacteria in the air,
The Water Molecule
other parts bring the air down to the lungs. The air passes through tissue into blood streams and the blood takes the O2 to cells in the body. Then when the waste products from respiration (H2O and CO2)are needed to exit the body, H2O is sweat out of the skin and CO2 exits through the alveoli when exhaled.


This shows the intake of oxygen in the body.

This shows the continuing steps in respiration.


Kittredge, Mary. The Respiratory System. New York: Chelsea House Publishers 1978.Print.
"living things." Compton's by Britannica. Encyclopædia Britannica Online School Edition.

Encyclopædia Britannica, Inc., 2011. Web. 27 Sept. 2011.


Arvey Project “Respiration” Human Physiology Bio 301Web September 20, 2011


Membrane (flesh)
Electrons (Electricity . a unit of charge equal to the charge on one electron.)
Homo sapiens (humans)