CELLULAR RESPIRATION

INTRODUCTION All cells must have energy to function. Glucose is a cell’s source of energy. In other words, glucose is cell food. Glucose is often stored in organisms as a carbohydrate called starch.

INTRODUCTION Many glucose molecules link together in order to from one starch molecule. In order to use starch, cells must break it down into the smaller glucose molecules.

INTRODUCTION Usable chemical energy is stored in the bonds of glucose molecules. Cell can release energy in 2 basic processes: Cellular respiration and Fermentation.

CELLULAR RESPIRATION In cellular respiration, cells use oxygen to release energy stored in the bonds of glucose molecules. Most of the energy used by the cells in your body is provided by cellular respiration.

LOCATION Cellular respiration takes place in organelles called mitochondria. Both plant cells and animal cells contain mitochondria, so both plant and animal cells release energy through cellular respiration.

A CHEMICAL CHANGE Reactants Glucose (C6H12O6) from food Oxygen (O2) from the air

A CHEMICAL CHANGE Chemical Reaction Glucose molecules in the cytoplasm are broken down into smaller molecules. These smaller molecules enter the mitochondria along with oxygen, where they recombine to form new substances

A CHEMICAL CHANGE Products Energy – some transferred to other molecules and sent to areas of the cells that need it; some released as heat. Carbon Dioxide (CO2) – released into the air Water (H2O) used by the organism

THE EQUATION Glucose + Oxygen Energy + Water + Carbon Dioxide

PUTTING IT ALL TOGETHER CARBON DIOXIDE GLUCOSE MITOCHONDRION ENERGY OXYGEN WATER