Cellular Respiration PhotosynthesisThere are two reactions (light and dark)

IN OUTCO2 GlucoseH2O O2

Energy (light)Balanced Equation

6CO2 + 6 H2O + Energy (light) C6H12O6 + 6O2

Cellular Respiration Cellular Respiration

taking glucose and O2 and making energy

C6H12O6 + O2

IN OUTGlucose CO2 O2 H2O

Energy (ATP)Balanced Equation

C6H12O6 + 6O2 6CO2 + 6 H2O + energy (ATP)

energy

Cellular Respiration Glycolysis (GLIE-KAHL-us-suhs)

* occurs in the cytoplasm* requires 2 ATP molecules to start the reaction* makes 4 ATP molecules* makes pyruvic acid

There is a NET GAIN of 2 ATP!

This process uses only 2% of the energy available in a glucose molecule.

What happens to the rest of the available energy?

Cellular Respiration Anaerobic respiration >>>NO OXYGEN PRESENT!

FermentationLactic Acid Fermentation

Remember: Glycolysis pyruvic acid lactic acid

*lactic acid fermentation starts when cells run low on O2

* you feel a burning sensation, especially in large muscles*After exercising, O2 levels increase

Why do you continue breathing hard after exercising?

This process is also used to make yogurt and cheese.

Cellular Respiration Alcohol Fermentation

Remember: Glycolysis pyruvic acid alcohol + CO2

* yeast (& other organisms) don’t need O2 to live/work*essential to make Beer and Bread

Beer Breadoats flourbarleysugaryeast yeast

H2O H2O

Alcohol evaporates, CO2 leaves holes & pockets in the bread as the bubbles pop!

Cellular Respiration Aerobic respiration >> OXYGEN PRESENT! Kreb’s cycle

* Occurs in the mitochondria*There is a NET GAIN of 2 ATP!

Remember: What was created in glycolysis?

2 - pyruvic acid molecules

Where in the cell does glycolysis take place?cytoplasm

So…. 2 pyruvic acid molecules move from the cytoplasm into the mitochondria

Cellular Respiration

Electron transport chain

*occurs in membrane of the cristae

*O2 is need during this process

There is a NET GAIN of 32 ATP’s!

Cellular Respiration1 Glucose molecule 2 ATP Glycolyisis 4 ATPKreb cycle 2 ATP

Electron Transport Chain 32 ATP

= 38 ATPminus 2 ATP

36 ATP’s

**This process is only 66% efficientThe remaining energy is released as body heat