CELLULAR RESPIRATION

Review Photosynthesis Autotrophs convert light energy into chemical energy CO 2 + H 2 O + light energy  C 6 H 12 O 6 + O 2

How do we get energy? From eating….unless you are a plant, right? Not so fast… Glucose (and other macromolecules) is not usable energy for cells Glucose must be converted to usable energy (ATP)

ATP Adenosine triphosphate Molecule that is usable energy for cells Energy is found in bonds between phosphate groups

Cellular Respiration Process that converts glucose energy into ATP energy Occurs in ALL living cells

Cellular Respiration Basics Chemical process which occurs in the Mitochondria C 6 H 12 O 6 + O 2  CO 2 + H 2 O + ATP

Types of Cellular Respiration Type 1: Aerobic Respiration Requires O 2 Type 2: Anaerobic Respiration Does not require O 2

Energy summary of Aerobic C.R. Glycolysis: Start with Chemical Energy (Glucose) Kreb’s Cycle: Convert to Usable Chemical Energy (many ATP) Electron Transport Chain: Make ATP and release Heat Energy

Anaerobic Respiration Much less efficient at converting glucose to ATP Occurs in 2 steps: 1. Glycolysis 2. Lactic Acid Fermentation (animals) OR Alcoholic Fermentation (plants)

Lactic Acid Fermentation Animals Some bacteria, some fungus Lactic acid is produced Why muscles are sore after a hard workout

Alcohol Fermentation Plants Some bacteria, some fungus Ethanol, CO 2 produced How yeast makes bread rise How alcoholic beverages are produced

Fermentation is useful

We eat more than carbohydrates…

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