Cell Energy: Cellular Respiration

Cellular Respiration The process where stored energy is converted to a usable form. Oxygen and glucose are converted to carbon dioxide, water, and ATP.

Cellular Respiration Equation (Opposite of photosynthesis) O 2 + C 6 H 12 O 6  CO 2 + H 2 O + ATP (oxygen) + (glucose)  (carbon dioxide) + (water) + (energy)

Who performs cellular respiration? All organisms!!!

Why is cellular respiration important? Cellular respiration is the process organisms use to obtain energy from the food they eat. Cells use the energy from cellular respiration for growth, repair, and maintenance.

Glycolysis (“Glucose-Breaking”) Takes place in the cytoplasm The glucose molecule is broken into two pieces. Glucose is converted to pyruvic acid: this conversion produces 2 ATP molecules.

Aerobic Respiration “Aerobic” means “with oxygen” Oxygen is required for these processes to occur: it is the final acceptor of electrons 34 ATP are produced Krebs cycle & the electron transport chain.

Mitochondrion The “Powerhouse of the Cell” Aerobic respiration takes place in the mitochondrion. This is where most of the ATP is produced.

The Krebs Cycle

Cellular Respiration: Pathways Glycolysis Anaerobic Respiration (fermentation) Aerobic Respiration Glucose With oxygen Without oxygen 2 ATP No additional ATP 34 ATP

Cellular Respiration