Bellringer Why do we eat? What is needed in order to make a fire burn? Burning Fuel

Cellular Respiration Chapter 2 Lesson 2

What Is Cellular Respiration? All of our energy comes from food Cellular respiration The process by which cells break down food (glucose) and release energy Living things need a constant supply of energy so they carry out cellular respiration continuously

What is Cellular Respiration? Storing and Releasing Energy When you eat you add to your body’s energy savings by storing glucose When you need energy, your cells break down the glucose through cellular respiration Breathing and Respiration Respiration can mean breathing (moving oxygen into your lungs) The oxygen is used to carry out cellular respiration

Mitochondria The powerhouse of the cell In the mitochondria Small sugar molecules are broken down with oxygen releasing large amounts of energy Cristae-folds where cellular respiration occurs

Cellular Respiration Stage 1 Glycolysis Occurs in the cytoplasm Glucose is broken down into smaller molecules WITHOUT oxygen releasing a small amount of energy

Cellular Respiration Stage 2 Krebs Cycle and Electron Transport In the mitochondria Small molecules are broken down in the presence of oxygen This forms carbon dioxide, water, and large amounts of ATP Chemical energy of the cell

The Cellular Respiration Equation

Comparing Two Energy Processes

Comparing Two Energy Processes

What Happens During Fermentation? Process in which cells release energy from food without using oxygen Without oxygen the products of cellular respiration are different Alcoholic Fermentation Ethyl alcohol is formed by yeast and some bacteria Lactic Acid Fermentation Lactic acid is formed by muscle cells when cellular respiration is done without oxygen