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)