• The process by which living things release energy stored in organic molecules
• Takes Place in 2 major stages
– Glycolysis
– Oxidative Respiration or Fermentation

The splitting of glucose into
2 three Carbon molecules called
Pyruvate
• Occurs in cytoplasm
• 4 ATP produced but 2 are used in process
• Does NOT require
OXYGEN

2
• Fermentation
• Process by which pyruvate is converted into either alcohol and
CO
2 or lactic acid
• Occurs in cytoplasm
• Only 2 ATP are produced
• NAD  NADH

The 3 steps of cellular respiration are:
• Glycolysis
• The Krebs cycle
• Electron Transport

• Each Cell uses between 1-2 billion
ATP/min.
• How many ATP’s are used each minute by all 100 trillion cells in the body?
• 1 glucose = 686 Cal
• 1 ATP = 7 Cal
• How efficient is aerobic respiration?
• 7x36= 252; 252\686 = 36%
• Automobiles are only 25% efficient in converting chemical energy into mechanical energy?

• Inability of muscle to contract
• Results from a deficit of ATP and/or accumulation of lactic acid  lowers pH

•
– After exercise, heavy breathing continues and oxygen consumption remains above the resting level
– Oxygen debt
– This added oxygen is used to restore muscle cells to the resting level in three ways
• 1) to convert lactic acid into glycogen
• 2) to synthesize creatine phosphate and ATP
• 3) to replace the oxygen removed from myoglobin

• Glycolysis 2 ATP
• Lactic Acid Fermentation 2 ATP
• Aerobic Respiration 36 ATP
• Creatine Phosphate (5x more than ATP)
(donates Phosphate to ADP  ATP)
• Exercise Requirements: 10 min. taps glycogen for glucose
• 10-30 min. Cells use either glucose or fatty acids (bloodstream)
• Beyond 30 min.  fatty acids are primary source

http://glencoe.mcgrawhill.com/sites/0003292010/student_view0/ chapter7/animations_and_videos.html# http://vimeo.com/10693405 http://www.bing.com/videos/watch/video/ homeboyz-teach-cellularrespiration/c882c7d87d7442735123c882c7 d87d7442735123-
1513821241783?q=cell+respiration+anima tion&FROM=LKVR5&GT1=LKVR5&FORM=L
KVR36 http://vcell.ndsu.nodak.edu/animations/etc
/movie-flash.htm
http://johnkyrk.com/krebs.html