Chapter 9: CELLULAR RESPIRATION

What is cellular respiration? The process that releases energy by breaking down glucose (sugar) and other food molecules in the presence of oxygen. 6O2 + C6H12O6  6CO2 + 6H20 + Energy

Two Types of Respiration Anaerobic Does NOT require oxygen Aerobic Does require oxygen Both types begin with a process called glycolysis.

Glycolysis Takes place in the cytoplasm of the cell. Process in which one molecule of glucose is broken in half, which produces two molecules of pyruvic acid. CCCCCCCCCCCC (glucose) CCC CCC (2 Pyruvic Acids)

Glycolysis Uses 2 ATP to begin 4 ATP molecules are produced Has a net gain of 2 ATP molecules -2 ATP +4 ATP 2 ATP

Electron Transport Chain Electrons carried in NADH Mitochondrion Pyruvic acid Electrons carried in NADH and FADH2 Glucose Electron Transport Chain Glycolysis Krebs Cycle Mitochondrion Cytoplasm

What happens after glycolysis? Anaerobic Respiration No oxygen Goes through a process called fermentation Aerobic Respiration Oxygen Present Goes through a process called the Krebs Cycle.

Krebs Cycle Takes place in the mitochondria Process in which pyruvic acid is broken down into carbon dioxide in a series of energy-extraction reactions. Begins with 2 ATP from glycolysis. The cellular respiration process continues with the electron transport chain.

Electron Transport Chain Electrons carried in NADH Mitochondrion Pyruvic acid Electrons carried in NADH and FADH2 Glucose Electron Transport Chain Glycolysis Krebs Cycle Mitochondrion Cytoplasm

Electron Transport Chain Takes place in the mitochondria. Uses high energy electrons from the Krebs cycle to convert ADP to ATP. After the Krebs cycle and electron transport chain, a total of 36 ATP are produced.

Electron Transport Chain Electrons carried in NADH Mitochondrion Pyruvic acid Electrons carried in NADH and FADH2 Glucose Electron Transport Chain Glycolysis Krebs Cycle Mitochondrion Cytoplasm

Fermentation Releases energy from food molecules by producing ATP in the absence of oxygen. Two Types: Alcoholic Fermentation Lactic Acid Fermentation Starts with 2 ATP from glycolysis and ends with 2 ATP.

Electron Transport Chain Electrons carried in NADH Mitochondrion Pyruvic acid Electrons carried in NADH and FADH2 Glucose Electron Transport Chain Glycolysis Krebs Cycle Mitochondrion Cytoplasm