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Interest Grabber. Section 9-1. 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.

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interest grabber
Interest Grabber

Section 9-1

  • 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.

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.

section outline
Section Outline

Section 9-1

  • 9–1 Chemical Pathways

A. 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 outline3
Section Outline

Section 9-2

  • 9–2 The Krebs Cycle and Electron Transport

A. 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

figure 9 2 cellular respiration an overview
Figure 9–2 Cellular Respiration: An Overview

Section 9-1

Mitochondrion

Electrons carried in NADH

Electrons carried in NADH and FADH2

Pyruvic acid

Glucose

Electron Transport Chain

Krebs Cycle

Glycolysis

Mitochondrion

Cytoplasm

chemical pathways
Chemical Pathways

Section 9-1

Glucose

Krebs cycle

Electrontransport

Glycolysis

Alcohol or lactic acid

Fermentation (without oxygen)

flowchart
Flowchart

Section 9-2

Cellular Respiration

Glucose(C6H1206)

+

Oxygen(02)

Glycolysis

KrebsCycle

ElectronTransportChain

Carbon

Dioxide

(CO2)

+

Water

(H2O)

figure 9 3 glycolysis
Figure 9–3 Glycolysis

Section 9-1

Glucose

2 Pyruvic acid

To the electron transport chain

figure 9 3 glycolysis8
Figure 9–3 Glycolysis

Section 9-1

Glucose

2 Pyruvic acid

To the electron transport chain

figure 9 3 glycolysis9
Figure 9–3 Glycolysis

Section 9-1

Glucose

2 Pyruvic acid

To the electron transport chain

figure 9 6 the krebs cycle
Figure 9–6 The Krebs Cycle

Section 9-2

Citric Acid Production

Mitochondrion

figure 9 6 the krebs cycle11
Figure 9–6 The Krebs Cycle

Section 9-2

Citric Acid Production

Mitochondrion

figure 9 7 electron transport chain
Figure 9–7 Electron Transport Chain

Section 9-2

Electron Transport

Hydrogen Ion Movement

Channel

Mitochondrion

Intermembrane

Space

ATP synthase

Inner

Membrane

Matrix

ATP Production

slide13
WHAT IF THERE ISN’T ANY OXYGEN?
  • CELLUAR RESPIRATION: Anaerobic (fermentation)
  • *yeast cells = alcohol production
  • *muscle cells = lactic acid production
figure 9 4 lactic acid fermentation
Figure 9–4 Lactic Acid Fermentation

Section 9-1

Lactic acid

Glucose

Pyruvic acid

figure 9 4 lactic acid fermentation15
Figure 9–4 Lactic Acid Fermentation

Section 9-1

Lactic acid

Glucose

Pyruvic acid

figure 9 4 lactic acid fermentation16
Figure 9–4 Lactic Acid Fermentation

Section 9-1

Lactic acid

Glucose

Pyruvic acid

pros and cons of lactic acid fermentation
Pros and Cons of Lactic Acid Fermentation
  • Pros – your muscle will keep working even without sufficient oxygen
slide18
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

recap 6c 6 h 12 o 6 6o 2 6co 2 6h 2 o energy atp
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
slide20
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
slide21
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
slide22
Autotrophs…
      • Make their own food/chemical energy
  • Heterotrophs…
      • Must eat other things to obtain chemical energy
  • Aerobic respiration requires…
      • Oxygen
video contents
Video Contents

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
video 1
Video 1

Video 1

  • Click the image to play the video segment.

Aerobic Respiration

video 2
Video 2

Video 2

  • Click the image to play the video segment.

Glycolysis

video 3
Video 3

Video 3

  • Click the image to play the video segment.

Krebs Cycle, Part 1

video 4
Video 4

Video 4

  • Click the image to play the video segment.

Krebs Cycle, Part 2

video 5
Video 5

Video 5

  • Click the image to play the video segment.

Electron Transport Chain, Part 1

video 6
Video 6

Video 6

  • Click the image to play the video segment.

Electron Transport Chain, Part 2

internet
Internet

Go Online

  • 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.
section 1 answers
Section 1 Answers

Interest Grabber Answers

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?

Students may answer that they feel no fatigue at the start of a run; however, after 1 minute and more so after 10 minutes, they are breathing hard, their heart rate has increased significantly, and their muscles may hurt.

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

Students may say that the increase in heart rate and breathing rate are a response that gets extra oxygen to the cells. The pain may be attributed to the cells becoming fatigued.

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.

Students may know that very high levels of performance can be sustained only very briefly even among the best of athletes. Students may say that the body runs out of readily available energy, food, or oxygen, or that the body builds up too many waste products in the cells.

section 2 answers
Section 2 Answers

Interest Grabber Answers

  • 1. Obtain two sheets of paper and a metric ruler. What is the surface area of the paper?
  • The area will vary depending on the size of paper used. A sheet of notebook paper has an area of approximately 600 cm3.
  • 2. Roll one sheet of paper into a tube lengthwise. What is the surface area of the rolled paper?
  • The surface area is the same as the original sheet of paper.
  • 3. Fold the second sheet of paper into a fan. Then, roll the firstsheet of paper around the folded paper so it is inside the rolled paper.What has happened to the surface area of the inside of the rolled paper?
  • The surface area has increased (surface area of rolled paper + surface area of folded paper).
  • 4. What would be the value of increasing the surface area of the membrane inside a mitochondrion?
  • Increasing the surface area increases the amount of space where chemical reactions can take place.
end of custom shows
End of Custom Shows
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