Cellular Respiration

1
Cellular Respiration
2
What is Cellular Respiration?

• Respiration is the process by which cells obtain
  energy from glucose.
• Cells break down simple food molecules (sugar)
  and release the energy they contain.
• Cellular Respiration is very different than the
  life process called Respiration, which
  breathing.

3
Two Types Of Cellular Respiration

• Anaerobic does NOT require Oxygen
• Takes place in the cytoplasm of cells
• Not very efficient, glucose only partially broken
  down
• Makes only 4 ATP
• Examples Alcohol Fermentation and Lactic Acid
  Fermentation
• Takes place in certain anaerobic bacteria

4
Two Types Of Cellular Respiration

• Aerobic Respiration
• Takes place in the Mitochondria of cells
• Efficient, glucose is completely broken down
• Makes 36 ATP
• Takes place 24/7 in most organisms

5
How Does Cellular Respiration Work?

• CR takes place in 2 stages.
• The first stage takes place in the cytoplasm, and
  molecules of glucose are broken down
  (anaerobic-no oxygen used).
• The second stage occurs in the Mitochondria, and
  there, small molecules are broken down into even
  smaller molecules (aerobic- needs oxygen).
• Energy is released at both stages.

6
What is the Equation for Cellular Respiration?

• C6H12O6 O2-----gt CO2 H2O Energy(ATP)
• GlucoseOxygen -----gt Carbon DioxideWaterEnergy

7
What is Fermentation?

• Some cells are able to obtain energy from food
  w/o using energy.
• These organisms (single-celled, dont need
  oxygen) obtain their energy through the process
  of Fermentation.
• Fermentation does not give off as much energy as
  Cellular Respiration.

8
Equation for Anaerobic Cellular Respiration

• Glucose ? Alcohol Carbon Dioxide ATP
• Glucose ? Lactic Acid ATP
• Only 4 ATP are produced during anaerobic
  respiration

9
Uses for Anaerobic Cellular Respiration

• Found in muscle cells during high intensity
  exercises (Lactic Acid)
• Used to make alcohol (beer, wine, whiskey),
  bread, yogurt and pickles
• Used during digestion in animals

10
Photosynthesis vs. Cellular Respiration

• Both involve the same chemical compounds, but are
  the reverse processes.
• CR produces CO2, while Photosynthesis uses up CO2
  in the atmosphere.
• CR uses O2, but Photosynthesis produces it.
• Photosynthesis requires energy from the sun,
  Cellular respiration gets energy from breaking
  down the chemical bonds in sugar molecules.

11
Photosynthesis vs. Cellular Respiration