The Krebs Cycle and Electron Transport

Glycolysis ReviewGlycolysis 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

FlowchartFlowchartSection 9-2

Glucose(C6H1206)

+Oxygen

(02)

GlycolysisKrebsCycle

ElectronTransport

Chain

Carbon Dioxide

(CO2)+

Water(H2O)

Cellular Respiration

Kreb’s CycleKreb’s CyclePyruvic 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 CycleKreb’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 CycleKreb’s Cycle

• The Kreb’s Cycle will go through ______for each ____ molecule of pyruvic acidCycle goes through twice per 1 molecule of sugar

• Products:8 2 – electron carrier2

Used for cellular activities6

Exhaled out

Electrons are moved to the ETC

Electron Transport Chain: OverviewElectron 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: DetailsElectron 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

Hydrogen Ion Movement

ATP Production

ATP synthase

Channel

Matrix

Inner Membrane

Intermembrane Space

Electron Transport ChainElectron Transport Chain

Energy and ExerciseEnergy 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 QuestionsReview Questions1. 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)