Storing EnergyStoring Energy

• Cells save energy Cells save energy produced by produced by photosynthesis by photosynthesis by transforming it into transforming it into carbohydrates such as carbohydrates such as sugars and starchessugars and starches

Cellular RespirationCellular Respiration

•When cells need energy, they get When cells need energy, they get it by breaking down these it by breaking down these carbohydrates, releasing and using carbohydrates, releasing and using that stored energy.that stored energy.•Because all living things need Because all living things need energy continuously, cells carry out energy continuously, cells carry out respiration continuously.respiration continuously.•This process uses oxygen.This process uses oxygen.

•During During respirationrespiration, , cells break down cells break down

simple food simple food molecules like molecules like

glucose and release glucose and release energyenergy

2 Stages of 2 Stages of RespirationRespiration

Stage 2:Stage 2: Occurs in the Occurs in the mitochondriamitochondria There a chemical reaction using There a chemical reaction using

oxygen breaks down these oxygen breaks down these molecules into even smaller molecules into even smaller molecules, molecules, producingproducing energy.energy.

This also produces This also produces COCO2 2 & H& H2200

FermentationFermentation Provides energy for cells Provides energy for cells withoutwithout

using using oxygenoxygen It produces It produces lessless energy than energy than

respirationrespiration Alcohol fermentationAlcohol fermentation occurs in occurs in

yeastyeast Lactic acidLactic acid fermentation fermentation takes takes

place inplace in muscles.muscles.