Cellular Respiration Energy From Food. What is Cellular Respiration ? Conversion of food/glucose into Energy (ATP) with oxygen present AEROBIC process=

Cellular Respiration

Energy From Food

What is Cellular Respiration ?

• Conversion of food/glucose into Energy (ATP) with oxygen present

• AEROBIC process= oxygen required

• Occurs in the mitochondria.

Tell your shoulder partner what the reactants and products are based on the pictures?

What do you guess is the goal?

What’s the Equation?

• Chemical Equation: 6O2 + C6H12O66CO2 + 6H20 + ATP Energy

• Word Form: Oxygen + Sugar Carbon dioxide + Water+ Energy (ATP)

• Reactants: – sugar (glucose) and oxygen.

Products: – Carbon dioxide, water, and energy (ATP).

Where does it Take Place?- Mitochondria- The cristae (folds of mitochondria)

is where ATP is made- 3 separate reactions occur:

Glycolysis, Krebs Cycle, Electron transport chain

What is Glycolysis? (Glucose Breaking)

• 1st step occurs in cytosol and is anaerobic

• 1 molecule of Glucose broken in half= 2 of pyruvic acid

• Makes 2 molecules of ATP• Glucose is starting molecule

Glucose--

Pyruvic acid

Review• Explain the role of organic (carbon

based) compounds in CR. (p.131,132)

• For each 6 carbon molecule (C6H12O6), how many molecules of ATP are used and how many are produced? (p. 132,133)

What is the Krebs Cycle?• 2nd reaction of cellular respiration is

aerobic/in mitochondria• Begins when pyruvic acid from

glycolysis enters mitochondria• Pyruvic acid converted to CO2(waste

product) (pg. 138)

• Makes 2 moleules of ATP

The Krebs Cycle•Begins when pyruvic acid produced by glycolysis enters the mitochondrion.•It is then turned to CO2 (waste product)

– And citric acid

What’s the Electron Transport Chain?

• 3rd stage of cellular respiration is aerobic/in mitochondria

• Occurs in the cristae (folded membranes of mitochondria)

• Uses the high-energy electrons from Krebs to convert ADP to ATP.

• Total ATP 32.• Produces Water as waste product

The Totals (ATP)

• Glycolysis=2 ATP• Krebs Cycle=2

ATP• Electron

Transport=32 ATP• TOTAL= 36 ATP

from 1 glucose molecule

Why Glucose into ATP?

It’s used to fuel/power cell activities

1.) ATP releases energy in a controlled way compared to glucose(think controlled fire vs explosion)

2.) ATP=immediate energy, glucose takes time

ATP = Adenosine Triphosphate

= A—P—P—P high energy bonds

When a cell needs energy, high energy bonds are broken by an enzyme.

+ P

A—P—P—P A—P—P

(ATP) (ADP)

energy

THE BIG PICTURE

Glucose &

Comparing Photosynthesis and Cellular Respiration

Definition:

What organelle:

Reactants:

Produces:

Equation:

What type of cell/

Organism:

Anaerobic vs. aerobic

Anaerobic means without oxygen (glycolysis)

Produces little ATPIt is how our body makes most of the energy

at the start of exercise

Aerobic means with oxygen (Krebs cycle and ETC) Produces 20 times more ATP than glycolysis aloneBody relies on it during extended physical

activities

Normal Cellular Respiration

Lactic Acid

Pyruvic Acid

Lactic Acid Fermentation- Occurs in cytoplasm (anaerobic-no oxygen) and creates lactic instead of CO2 and H2O.

Lactic Acid

Pyruvic Acid