http://www.ck12.org Chapter 3. Chemical Interactions
FIGURE 3.83
A:Breathing consists of inhaling and exhaling, and its purpose is to move gases into and out of the body. Oxygen
needed for cellular respiration is brought into the body with each inhalation. Carbon dioxide and water vapor
produced by cellular respiration are released from the body with each exhalation.
Energy Changes in Cellular Respiration
The reactions of cellular respiration are catabolic reactions. In catabolic reactions, bonds are broken in larger
molecules and energy is released. In cellular respiration, bonds are broken in glucose, and this releases the chemical
energy that was stored in the glucose bonds. Some of this energy is converted to heat. The rest of the energy is used
to form many small molecules of a compound called adenosine triphosphate, or ATP. ATP molecules contain just
the right amount of stored chemical energy to power biochemical reactions inside cells. You can see these energy
changes in cellular respiration in the video at this URL: http://www.youtube.com/watch?v=JyMfKP1D7OE.
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/5094Summary
- Cellular respiration is the process in which the cells of all living things break down glucose with oxygen to
produce carbon dioxide and water. - Cellular respiration is a catabolic process that releases energy by breaking bonds in glucose. It uses the energy
to form ATP, a small molecule that stores just the right amount of energy for cells to use.