Cell Energy: Cellular Respiration

Cellular Respiration

Definition: 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)

O2 + C6H12O6 CO2 + H2O + ATP(oxygen) + (glucose) (carbon dioxide) + (water) + (energy)

Reactants Products

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.

Processes involved

Glycolysis Aerobic Respiration

Kreb’s Cycle/Citric Acid Cycle Electron Transport Chain (ETC)

Glycolysis (“Glucose-Breaking”)

Takes place in the cytoplasmThe 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 (Citric Acid) & the

electron transport chain (ETC)

MitochondrionThe “Powerhouse of the Cell”

Aerobic respiration takes place in the mitochondrion.

This is where most of the ATP is produced.

Cellular respiration is like a mirror image of photosynthesis.

The Krebs cycle transfers energy to an electron transport chain. takes place in

mitochondrial matrix breaks down three-carbon

molecules from glycolysis

– makes a small amount of ATP– releases carbon dioxide– transfers energy-carrying

molecules

6H O2

6CO2 2

6O 2

mitochondrion

matrix (area enclosedby inner membrane)

inner membrane

ATP

ATP

energy

energy from glycolysis

1

2

4

3

Krebs Cycle

Pyruvic Acid

ETC

6H O2

6CO2 2

6O 2

mitochondrion

matrix (area enclosedby inner membrane)

inner membrane

ATP

ATP

energy

energy from glycolysis

1

2

4

3

The Krebs Cycle/Citric Acid Cycle

6H O2

6CO 2

6O 2

mitochondrion

matrix (area enclosedby inner membrane)

inner membrane

ATP

ATP

energy

energy from glycolysis

1

2

4

3

and

• The electron transport chain produces a large amount of ATP.– takes place in inner

membrane– energy transferred to

electron transport chain– oxygen enters process– ATP produced– water released as a

waste product

Electron Transport

ETC

Electron Transport Chain

Cellular Respiration: Pathways

Glycolysis

Anaerobic Respiration(fermentation)

Aerobic Respiration

Glucose

With oxygenWithout oxygen

2 ATP

No additional ATP34 ATP

Cellular Respiration

Anaerobic Respiration

Lactic Acid Fermentation Alcoholic Fermentation