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Cellular Energy
Photosynthesis
Energy in Living Systems
I. All organisms need energy I. The sun is the first and largest source
of energy
II. Autotrophs
I. Organisms that gather their own energy
III. Heterotrophs
I. Organisms that gather energy from other organisms
Metabolism
• Metabolism– Set of all chemical reactions that occur
in the body– Chemical Reactions
• Processes that result in the changing of substances
• Adenosine Triphosphate– ATP– Energy Money in Cell
Photosynthesis –Sun Energy
Photosynthesis• In the chloroplasts
Steps• Absorption of Light
• Energy is captured from the sunlight
• Electron Transport Chain• Light energy is converted to
chemical energy ATP
• Calvin Cycle• ATP powers the formation of
organic compounds
Wrap-Up
The ingredients are light, carbon dioxide and water
The end result is sugar and oxygen (which is released into the atmosphere)