Respiration

Week of October 15, 2012

Photosynthesis

•          The process of changing light energy to chemical energy

•          Energy stored as sugar

•          Occurs in plants and some algae

•          Plants need light energy, CO₂, and H₂O

•          Takes place in the chloroplasts, using chlorophyll, the green pigment in plants.

                               6CO₂ + 6H₂O + Light Energy ------>C₆H₁₂O₆ + 6O₂                 carbon dioxide + water + sun's light --------> glucose + oxygen 
      Cellular Respiration

•         The breakdown of glucose molecules (from photosynthesis in plants) to release energy

•         Takes place in all living things in the mitochondria of the cell.

•         Respiration is the opposite of photosynthesis. 
                     
                    C₆H₁₂O₆  +  6O₂ ----------> 6CO₂+6H₂O
                     glucose + oxygen ------>  carbon dioxide + water            

Oxygen combines with sugars to break molecular bonds, releasing the energy (in the form of ATP) contained in those bonds. In addition to the energy released, the products of the reaction are carbon dioxide and water. 
                                      Click here to see powerpoint.

The Respiratory System

       Purpose of the respiratory system (exchange of gases)

•          To provide a constant supply of oxygen to keep your body cells functioning.

•          To remove carbon dioxide from the body cells.

                                               Click here to view the powerpoint.