Cellular Respiration

Do Now : Why do we need to breathe?

Equation

Oxygen + GlucoseCarbon dioxide + Water + ATP

26 12 62 2

Reactants Products

2 Kinds of Cellular Respiration• Aerobic: Occurs in the

presence of oxygen

• Anaerobic: Occurs when no oxygen is present.

Aerobic Respiration3 stages

1. Glycolysis

2. Krebs cycle

3. Electron Transport Chain

Glycolysis• First stage in cellular respiration

• Only stage that does not require O2

One cell can produce thousands of ATP molecules in a few milliseconds!!!

Requires 2ATPs to start.

End Product = 4 ATP

Net Gain: 2 ATP

REVIEW: What is the purpose of glycolysis?

To break down glucose

Krebs Cycle• CO2 is released as a waste gas

• Requires O2

• Occurs in

mitochondria

• Produces 2 ATPs

Electron Transport Chain

• ADP is converted into ATP

• Up to 34 ATPs can be produced

Aerobic respiration yields a net total of 36-38 ATPs

Question:Which step of aerobic respiration produces the most ATPs (most efficient step)?

ETC- Electron Transport Chain

Question :In what part of the cell aerobic respiration takes place?

Mitochondria

AIM : FermentationDo Now Discuss photosynthesis and explain its importance to an organism. In your answer, be sure to: • identify the organelle where this process occurs• identify two raw materials necessary for this process• identify one energy-rich molecule that is produced by this process• state how organisms use the energy-rich molecule that is produced• state how a gas produced by this process is recycled in nature

Fermentation• Anaerobic process: occurs in absence

of O2.

• Recycles NAD+ ,so that glycolysis can continue producing 2ATPs for every round.

• Does not produce any ATP

2 kinds of fermentation:1. Alcoholic Fermentation

2. Lactic Acid Fermentation

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Alcoholic Fermentation

2 +

Ex: Yeast in Bread

Lactic Acid Fermentation+

Produced in muscle cells during exercise when body is no longer able to supply O2 to cells.