Cellular Respiration Notes

Pre-Quiz

1. In what organelle does cellular respiration take place?

a. Chloroplast

b. Nucleus

c. Mitochondria

Pre-Quiz

2. Does aerobic respiration require oxygen?

Pre-Quiz

3. Which of the following is not part of cellular respiration?

a. Calvin Cycle

b. glycolysis

c. modification of pyruvate

d. electron transport chain

Pre-quiz

4. How many ATP are made during aerobic respiration?

a. 2

b. 8

c. 32

d. 36

Pre-Quiz

5. What causes muscle fatigue?a. Aerobic respiration

b. Lactic acid fermentation

c. Alcoholic fermentation

Cellular Respiration

• The process by which mitochondria break down food molecules to produce ENERGY (ATP)!

Aerobic Respiration (with Oxygen)

• Exists in 4 Stages1.Glycolysis

2.Modification of Pyruvate

3.Citric Acid Cycle / Krebs Cycle

4.Electron Transport Chain

Glycolysis

• Breaking down glucose– Occurs in the cytoplasm of the cell.– chemical reactions that break down glucose in to 2

pyruvates.– 2 ATP are used and 4 ATP are produced = net gain

of 2 ATP.

Modification of Pyruvate• Pyruvate is changed into Acetyl Co-A• Occurs in the mitochondria• Products:

– 1 CO2

– 1 NADH which is an electron carrier.

Citric Acid Cycle / Krebs Cycle

• 1 Glucose = 2 turns of the cycle.

• Products:– 2 More CO2

– More electron carriers (3 NADH & 1 FADH2)

– 1 ATP produced per turn.

Kreb’s Cycle

Electron Transport Chain• Electron carriers pass

electrons from protein to protein in the inner membrane of the mitochondria.

• This forms ATP!• The electron is

accepted by oxygen and water is produced.

• This chain produces 32 ATP.

ETC (Electron Transport Chain)

ATP Synthesis

Overall Equation for Cellular Respiration

• C6H12O6 + 6O2 6CO2 + 6H2O + energy

Overall Energy Output (for aerobic respiration):

• 2 ATP from Glycolysis• 2 ATP from Krebs Cycle• 32 ATP from Electron Transport Chain• 36 ATP Total • Animation

Anaerobic Respiration (with out Oxygen)

• Lactic Acid Fermentation– used by animals and some plants

(cells) when the electron transport chain backs up due to lack of oxygen.

– produces a byproduct known as lactic acid (toxic to cells)

– Results in muscle fatigue.

– Only get 2 ATP from this process.

Anaerobic Respiration (with out Oxygen)

Alcoholic Fermentation• used by yeast as

well as others to produce CO2 and ethyl alcohol.