Cellular respiration chapter 7
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CELLULAR RESPIRATION Chapter 7. ORGANELLE OF FOCUS. OVERALL EQUATION. C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + energy(ATP) Glucose + Oxygen  Carbon Dioxide + Water + ATP Adenosine triphosphate. VOCABULARY. Autotrophs

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Overall equation
OVERALL EQUATION

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

Glucose + Oxygen  Carbon Dioxide + Water + ATP

Adenosine triphosphate


Vocabulary
VOCABULARY

  • Autotrophs

  • Organisms that are able to produce their own chemical energy (food), ex. plants

  • Heterotrophs

    • Organisms that obtain their chemical energy from other sources, by eating ex. animals

  • Cellular Respiration

    • Breaking down organic molecules to produce energy

  • Aerobic Respiration

    • Oxygen present for pathway of breaking down food

  • Anaerobic Respiration

    • No Oxygen present - causes an alternative pathway


Focus on aerobic pathway for cellular respiration
Focus on Aerobic Pathway for Cellular Respiration

  • STEPS

    • 1. Glycolysis – splits the glucose in half (6C to 3C), occurs in cytoplasm of cell

    • 2. Pyruvic acid conversion – loss of CO2 produces a product ready for the next step, occurs in mitochondria

    • 3. Kreb Cycle – breaks down the remaining carbons from what’s left of the glucose molecule, produces high energy products NADH and FADH2, , occurs in matrix of mitochondria


Steps continued
Steps continued

-4. Electron Transport Chain – a series of proteins along the inner membrane of mitochondria that pass e-

* OXYGEN is the final acceptor of electrons

* H+ build up powers ATP synthase (sound familiar)


Glycolysis http instruct1 cit cornell edu courses biomi290 asm glycolysis dcr
Glycolysishttp://instruct1.cit.cornell.edu/courses/biomi290/ASM/glycolysis.dcr



Kreb cycle http www2 nl edu jste aerobic respiration htm
Kreb Cyclehttp://www2.nl.edu/jste/aerobic_respiration.htm

Where does CO2 go?

Where do NADH and FADH2 go?


Electron Transport Chain (ETC)http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter9/animations.html#



What happens if no oxygen is present
WHAT HAPPENS IF NO OXYGEN IS PRESENT??

Can’t do Electron Transport Chain so…

no use doing Kreb cycle. Why not?

  • NADH and FADH2 have nowhere to go if ETC not running.


Anaerobic pathways
ANAEROBIC PATHWAYS

  • Alcohol Fermentation – organism produce alcohol from pyruvic acid ex. Yeast cells

  • Lactic Acid Fermentation – muscle cells not receiving enough oxygen so they produce lactic acid from pyruvic acid


Alcohol fermentation
Alcohol Fermentation

How many ATP?

2


Lactic acid fermentation
Lactic Acid Fermentation

How many ATP?

2


Pros and cons of lactic acid fermentation
Pros and Cons of Lactic Acid Fermentation

  • Pros – your muscle will keep working even without sufficient oxygen


LIVER


Recap c 6 h 12 o 6 6o 2 6co 2 6h 2 o energy atp
RECAP crampingC6H12O6 + 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


  • 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


  • 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


  • Heterotrophs…

    • Must eat other things to obtain chemical energy

  • Aerobic respiration requires…

    • Oxygen




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