Anaerobic Respiration

1
Anaerobic Respiration

• Breaking down glucose in the absence of oxygen

2
Anaerobic Respiration in animal cells

• The breakdown of glucose in cells in the absence
  of oxygen
• During vigorous exercise when not enough oxygen
  to meet demands.
• Glucose is only partly broken down and only 2 ATP
  molecules are made

3
Anaerobic respiration in animal cells

• Starts with glycolysis

Lactic Acid
reversible
4
Effect of Lactic Acid

• Formed when not enough oxygen present for aerobic
  respiration
• Makes muscles sore muscle fatigue
• When exercise stops breathing takes in oxygen and
  the lactic acid is converted back to pyruvic acid
• This is called the oxygen debt the volume of
  oxygen required to convert lactic acid back to
  pyruvic acid

5
Anaerobic Respiration in plant and yeast cells

• Again glucose partially broken down in absence of
  oxygen
• Can occur when root cells growing in muddy soil
  or when yeast is used in brewing and bread making
• Again only 2 ATP molecules are made

6
Anaerobic Respiration in plant and yeast cells

• Glycolysis takes place first

Ethanol and Carbon Dioxide
NOT REVERSIBLE
7
Experiment

• Demonstrating anaerobic respiration in yeast
• Lime water to test for presence of carbon dioxide
• Glucose boiled to remove oxygen
• Layer of oil to prevent oxygen getting in

8
Experiment Results

• Increase in temperature noted as yeast cells
  respire and release energy
• Lime water turns cloudy showing the presence of
  carbon dioxide
• Alcohol smell given off