Admit Slip

Based on the BTB /cell respiration lab, what are TWO components of the cellular respiration equation. HINT: Think- what went in vs. out (reactant vs. product)

2/6/15

Date: 2/6/15 Topic: Cellular Respiration Page # ___

Today in Room 315…

ADMIT SLIP: In journal… how does our body access energy in food?HW: Complete Glycolysis Review WorksheetCONTENT OBJ: SW explore the first stage of cellular respiration using online animationsLANG. OBJ: SW write notes in their journals and then complete their Glycolysis Web QuestANNOUNCEMENTS: DO NOT LOSE YOUR SHEETS!AGENDA:Glycolysis class notesGlycolysis Web QuestEXIT SLIP: All computers plugged in and away

Date: 2/6/15 Topic: Cellular Respiration Page # ___

Cellular Respiration*

The process that helps our cells ACCESS the energy in food

More scientifically… “The process in which a cell breaks down sugar or other organic

compounds to release energy used for cellular work.”

ATP!

ATP*

A = adenosine

T = tri

P = phosphate

Energy storage molecule in all organisms

Cellular Respiration Equation*

6O2 + C6H12O6 -->  6H2O + 6CO2 + energy

• Explanation?

• Also, how many of each molecule are present?

Glucose found in food!

Cell Resp. has 3 Steps*

1) Glycolysis

2) Krebs Cycle

3) Electron Transport Chain

Glycolysis*

To start reaction, need2 ATP (like needing two tokens to play an arcadegame)

Glucose (6 carbons, represented w/ 6 circles)is broken down into 2molecules (PGAL)

**Occurs in the cytoplasm of the cell**

Glycolysis*

Two PGAL molecules arethen broken down to release4 ATP molecules and 2 highenergy electron carriers,known as NADH molecules

PGAL gets broken down to pyruvate

Glycolysis End Products*4 ATP (net 2 ATP- why?)

2 NADH (high energyelectron carriers)

2 pyruvate (3 carbons each)also known as pyruvic acid

Aerobic vs. Anaerobic*

Aerobic means?

REQUIRES oxygen

Anaerobic means?

Does NOT require oxygen Certain exercises require oxygen (ex. running) while some do not (you breathe before and after each lift, but not during!)

Pyruvate has 2 pathways*

Aerobic (oxygen available)

Pyruvate molecules head to Kreb’s cycle

Anaerobic (oxygen unavailable)

Pyruvate molecules go through…

Lactic acid fermentation OR

Alcohol fermentation

Lactic Acid Fermentation*Pyruvate is brokendown into…

lactic acid(or lactate)

NAD+

Lactic acid is producedby the muscles (thoughthis process) when they are not supplied enough oxygen, and it causes a burning sensation. That’s why your muscles burn when you work out!

Alcohol Fermentation*Pyruvate is brokendown into…

Carbon dioxide

Ethanol

NAD+

These processes…

1) Make bread rise and sparkling drinks (CO2)

2) Make wine/beer alcoholic(ethanol)

Glycolysis Web QuestOver the next few days, we will be learning about all the stages of cellular respiration

But for today, you are just going to focus on glycolysis

You are to complete the Glycolysis Web Quest using two videos posted on the website under today’s date

Make sure to follow all directions, and DON’T LOSE YOUR SHEET! (You will also need it tonight for HW)

You may go get your computers…

Glycolysis HW

Use the diagram provided to write a one page description of glycolysis and the two following pyruvate pathways.

What occurs in each situation, and what is produced?

Due TOMORROW!!

Admit Slip

Answer in journal:

Why do your muscles burn after

intense exercise?

2/9/15

Date: 2/9/15 Topic: Cellular Respiration 2 Page # ___

Today in Room 315…

ADMIT SLIP: In journal… how does our body access energy in food?HW: Complete Glycolysis Review WorksheetCONTENT OBJ: SW explore the first stage of cellular respiration using online animationsLANG. OBJ: SW write notes in their journals and then complete their Glycolysis Web QuestANNOUNCEMENTS: DO NOT LOSE YOUR SHEETS!AGENDA:Glycolysis class notesGlycolysis Web QuestEXIT SLIP: All computers plugged in and away

Date: 2/9/15 Topic: Cellular Respiration 2 Page # ___

Two other steps of cell resp?

1) Glycolysis

2) ____________________________

3) ____________________________

After glycolysis…*And in the PRESENCE of oxygen,pyruvate goes through respiration,

Where pyruvate is converted to Acetyl CoA

2 NADH & 2 CO2 produced

Acetyl CoA required forKreb’s cycle

Kreb’s Cycle*Also knows as the “Citric Acid Cycle”

Takes place in the mitochondria

6 CO2 are released

2 ATP generated

2 FADH2 are generated

8 NADH are generated

ATP Count- where we at??

Glycolysis 2 ATP

Kreb’s Cycle 2 ATP

Total = 4 ATP

But a working muscle recycles over 10 MILLION ATP every second…

So we need MORE!

Electron Transport Chain*

Goal: To break down NADH and FADH2 into ATP

ETS creates proton gradient by pumping H+ to outer compartment of mitochondria

Electron Transport Chain*H cleaved (taken off) NADH & FADH2 now H atoms

Electrons stripped (taken off) from H atoms become H+ (protons)

Use flow of electrons asenergy to pump protons across inner membrane and into inter membrane space NAD+

Q

C

NADH H2O

H+

e–

2H+ + O2

H+H+

e–FADH2

12

NADH dehydrogenase

cytochrome bc complex

cytochrome coxidase complex

FAD

e–

ATP Synthase*Final step after the electron transport chain (ETC)

Protons now in intermembrane space are funneled into ATP synthase (a protein), which produces ATP

ETC + ATP Synthasegenerates 36 ATP

Other names…*Production of ATPusing ATP synthase= “chemiosmosis”

(duchemicals diffuseacross membrane)

ETC + chemiosmosis = “oxidative phosphorylation”

(oxidation -> loss of e-, phosphorylation-> phosphate groups)

2 ATP + 2 ATP + 36 ATP = 40 ATP per one molecule glucose!

Cellular Respiration Overview*

Aerobic vs. Anaerobic Energy Yield*

Aerobic respiration produces 38 ATP(2 from Kreb’s + 36 from ETC)

Anaerobic respiration produces 2 ATP(only get the 2 ATP from glycolysis)

So aerobic respiration is 19 times more efficient than aerobic respiration! (aka oxygen = awesome)

Any questions??

Web Quest Continued

You will now watch the remaining segments in JUST VIDEO 1 and fill out your guided notes

When you are done you will have a full packet of Cellular Respiration notes! (STUDY STUDY STUDY!)

Questions?

If not, go grab computers…

Cellular Respiration HW

Cellular Respiration Review Packet

Whole Packet Due THURSDAY!!