Transcript Kreb`s Cycle - greinerudsd

The Krebs Cycle and Electron
Transport
Glycolysis Review
• Glycolysis is the process of taking one molecule
of glucose and breaking it down into 2 molecules
of pyruvic acid
–
–
–
• When glycolysis is over, the presence of oxygen
is determined
– If no 
– If yes 
Section 9-2
Flowchart
Cellular Respiration
Glucose
(C6H1206)
+
Oxygen
(02)
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
Carbon
Dioxide
(CO2)
+
Water
(H2O)
Kreb’s Cycle
Pyruvic Acid loses a carbon atom in the
form of carbon dioxide
•
•
This 2-carbon molecule will bind with
Coenzyme A to form
• This molecule can now enter
Kreb’s Cycle
• During the Kreb’s cycle, pyruvic acid is
broken down into _____________ in a
series of energy-extracting reactions
Also known as the
Occurs in the
Mitochondria
inter mitochondrial
space = between 2
membranes
Kreb’s Cycle
• The Kreb’s Cycle will go through ______for each
____ molecule of pyruvic acid
 Cycle goes through twice per 1 molecule of sugar
• Products:
8
2
2
– electron carrier
 Used for cellular activities
6
 Exhaled out
Electrons are
moved to the
ETC
Electron Transport Chain: Overview
• Electrons from the electron carriers (NADH &
FADH2) are sent through a series of molecules
to create 
The electrons, once at the end of the chain, will
attach to ________ ions and oxygen atoms to
form _______
Occurs on the _______ membrane of the
mitochondria
Electron Transport Chain: Details
• NADH & FADH2 carry high energy electrons to
_____
• Flow of electrons along ETC causes  pumping
of H+ into intermembrane space
• _____ builds up
• H + diffuses out through  ___________
– ADP and P join to form ATP
• Electrons at end of ETC join  H+ and O2 to
make ________
– Oxygen acts as the “final electron acceptor”
Electron Transport Chain
Electron Transport
Hydrogen Ion
Movement
Channel
ATP synthase
Intermembrane
Space
Inner
Membrane
Matrix
ATP
Production
Energy and Exercise
• Cells normally contain small amounts of ATP
produced by glycolysis and cellular respiration
– Only enough for a few seconds of activity
• For activities that are “quick”
Once this is used up, muscles get their energy from lactic acid
fermentation
• For activities that are “longer distance”
– Stored energy in the muscles (a sugar called
glycogen) will break down
• Lasts for about 20-30 minutes
• Then the body will break down other energy containing
molecules like fat
Review Questions
1. Where does the Krebs cycle take place?
2. What are the steps for the Krebs cycle starting with
pyruvic acid?
3. What are the products of the Krebs cycle?
4. What is the electron transport chain and how is it used to
produce ATP?
5. What acts as the final electron acceptor for the electron
transport chain?
6. How does your body store energy for exercise?
Cellular Respiration Videos
• Cellular Respiration Ninja Enzymes (4:15)
• Cellular Respiration Song (5:22)
• Cellular Respiration with People & Playground (3:15)
• Cellular Respiration with Signs (3:33)
• Cellular Respiration Rap (2:55)
Cellular Respiration Animations
• Krebs Cycle: Part 1
• Krebs Cycle: Part 2
• Electron Transport Chain: Part 1
• Electron Transport Chain: Part 2
• Electron Transport Animation (1:59)