Go to Section:. Interest Grabber Feel the Burn Do you like to run, bike, or swim? These all are good ways to exercise. When you exercise, your body uses.

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Interest Grabber

Feel the Burn

Do you like to run, bike, or swim? These all are good ways to exercise. When you exercise, your body uses oxygen to get energy from glucose,a six-carbon sugar.

Section 9-1

1. How does your body feel at the start of exercise, such as a long, slowrun? How do you feel 1 minute into the run; 10 minutes into the run?

2. What do you think is happening in your cells to cause the changesin how you feel?

3. Think about running as fast as you can for 100 meters. Could youkeep up this pace for a much longer distance? Explain your answer.

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OVERALL EQUATION

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

Glucose + Oxygen Carbon Dioxide + Water + ATP (Adenosine triphosphate)

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Section Outline

9–1 Chemical PathwaysA. Chemical Energy and Food

B. Overview of Cellular Respiration

C. Glycolysis

1. ATP Production

2. NADH Production

D. Fermentation

1. Alcoholic Fermentation

2. Lactic Acid Fermentation

Section 9-1

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Section Outline

9–2 The Krebs Cycle and Electron TransportA. The Krebs Cycle

B. Electron Transport

C. The Totals

D. Energy and Exercise

1. Quick Energy

2. Long-Term Energy

E. Comparing Photosynthesis and Cellular Respiration

Section 9-2

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ORGANELLE OF FOCUS

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GlucoseGlycolysis

Cytoplasm

Pyruvic acid

Electrons carried in NADH

Krebs Cycle

Electrons carried in

NADH and FADH2 Electron

Transport Chain

Mitochondrion

Figure 9–2 Cellular Respiration: An Overview

Mitochondrion

Section 9-1

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Glucose

Glycolysis Krebs cycle

Electrontransport

Fermentation (without oxygen)

Alcohol or lactic acid

Chemical Pathways

Section 9-1

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Flowchart

Section 9-2

Glucose(C6H1206)

+Oxygen

(02)

GlycolysisKrebsCycle

ElectronTransport

Chain

Carbon Dioxide

(CO2)+

Water(H2O)

Cellular Respiration

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Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

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Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

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Glucose

To the electron transport chain

Figure 9–3 Glycolysis

Section 9-1

2 Pyruvic acid

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Citric Acid Production

Figure 9–6 The Krebs Cycle

Section 9-2

Mitochondrion

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Citric Acid Production

Figure 9–6 The Krebs Cycle

Section 9-2

Mitochondrion

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CHECK FOR UNDERSTANDING

BEFORE WE GO ANY FURTHER – SEE HOW WELL YOU UNDERSTAND THE FIRST TWO STEPS IN CELLULAR RESPIRATION:

Answer the questions in your notes, use your textbook Ch9.

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Figure 9–7 Electron Transport Chain

Section 9-2

Electron TransportHydrogen Ion Movement

ATP Production

ATP synthase

Channel

Inner Membrane

Matrix

Intermembrane Space

Mitochondrion

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Summary Chart

Input Step Outputs ATPs

Total ATPS________

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SUMMARY

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WHAT IF THERE ISN’T ANY OXYGEN?

CELLUAR RESPIRATION: Anaerobic (fermentation)

*yeast cells = alcohol production

*muscle cells = lactic acid production

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Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

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Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

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Glucose Pyruvic acidLactic acid

Figure 9–4 Lactic Acid Fermentation

Section 9-1

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Pros and Cons of Lactic Acid Fermentation

Pros – your muscle will keep working even without sufficient oxygen

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Cons – you feel it, lactic acid causes sore muscles and cramping

Your body will get rid of lactic acid – it diffuses into blood and goes to liver where it is converted back to pyruvic acid – ready for O2

LIVER

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RECAP6C6H12O6 + 6O2 6CO2 + 6H2O + energy (ATP)

GLUCOSE becomes…• CO2

Oxygen is needed…• to accept the electrons at the end of ETC

CO2 goes…• into blood, lungs, exhaled

Water is produced when…• O2 collects enough e- and H+ to become water

ATP is produced…• in glycolysis, Kreb Cycle and mainly in ETC due to chemiosmosis

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Pyruvic acid is made …• at the end of glycolysis (3C)

NADH and FADH2 carry …• Electrons and H+ to the ETC

Protons (H+) build up in the …due to…• Intermembrane space, ETC pushing them out

ATP synthase allows H+ to … and …• Back into the matrix, produces ATPs

If no oxygen, yeast produce…• ethanol

If no oxygen, muscle cells produce…• Lactic acid

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The ETC produces...

• 34 ATPs

In aerobic respiration, Pyruvic acid is converted to…

• Acetyl CoA

The molecule that must be recycled in the Kreb cycle is…

• Oxaloacetic acid

The break down of one glucose gives…

• 38 total ATP

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Autotrophs…

• Make their own food/chemical energy

Heterotrophs…

• Must eat other things to obtain chemical energy

Aerobic respiration requires…

• Oxygen

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VIDEO LINKS

•FROM FOOD TO ATP

•Cellular Respiration Overview

Video Contents

Click a hyperlink to choose a video.

Aerobic Respiration

Glycolysis

Krebs Cycle, Part 1

Krebs Cycle, Part 2

Electron Transport Chain, Part 1

Electron Transport Chain, Part 2

Click the image to play the video segment.

Video 1

Aerobic Respiration

Click the image to play the video segment.

Video 2

Glycolysis

Click the image to play the video segment.

Video 3

Krebs Cycle, Part 1

Click the image to play the video segment.

Video 4

Krebs Cycle, Part 2

Click the image to play the video segment.

Video 5

Electron Transport Chain, Part 1

Click the image to play the video segment.

Video 6

Electron Transport Chain, Part 2

Links from the authors on Creatine

Share kimchi lab data

Interactive test

For links on cellular respiration, go to www.SciLinks.org and enter the Web Code as follows: cbn-3091.

For links on the Krebs cycle, go to www.SciLinks.org and enter the Web Code as follows: cbn-3092.

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