cellular respiration energy from food. what is cellular respiration ? conversion of food/glucose...
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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--
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
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
Lactic Acid
Pyruvic Acid
Lactic Acid Fermentation- Occurs in cytoplasm (anaerobic-no oxygen) and creates lactic instead of CO2 and H2O.
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