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 Cellular RespirationRespiration

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

release energyrelease energy The Respiration EquationThe Respiration Equation:: CC66HH1212OO66 + 6 O + 6 O22 >>> 6 CO >>> 6 CO22 + 6 H + 6 H22O + energyO + energy (glucose) (oxy.) (carb. Diox.) (water)

2 Stages of 2 Stages of RespirationRespiration

Stage 1:Stage 1: takes place in the cytoplasm where glucose molecules are broken down into smaller molecules.

Stage 2:Stage 2: Occurs in the Occurs in the mitochondriamitochondria There a chemical reaction There a chemical reaction using oxygen breaks down using oxygen breaks down these molecules into even these molecules into even smaller molecules, smaller molecules, producingproducing energy.energy.

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

FermentatioFermentationn

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.