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(c) Geromil J. Lara, RMT, MSMT
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BIOENERGETICSHOW THE BODY CONVERTS FOOD TO ENERGY
Geromil J. Lara, RMT, MSMT
METABOLISM• Is the sum total of all the chemical
reactions involved in maintaining the dynamic state of the cell– Metabolic Reactions
• Those in which molecules are broken down to provide the energy needed by cells – catabolism
• Those that synthesize the compounds needed by cells – anabolism
METABOLISM• Biochemical Pathway
– Is a series of consecutive biochemical reactions• Carbohydrates• Lipids• Proteins
• Common Catabolic Pathway– To convert the chemical energy in food
to molecules of ATP
METABOLISM• Principal Compounds of the
Common Catabolic Pathway– Common Catabolic Pathway
• Citric Acid Cycle
• Oxidative Phosphorylation Pathway– Electron Transport Chain– Phosphorylation
METABOLISM• Principal Compounds of the
Common Catabolic Pathway– Agents for Storage of Energy and
Transfer of Phosphate Groups
• Adenosine Monophosphate (AMP)• Adenosine Diphosphate (ADP)• Adenosine Triphosphate (ATP)
METABOLISM• Principal Compounds of the
Common Catabolic Pathway– Agents for Transfer of Electrons in
Biological Oxidation-Reduction Reactions• Coenzymes
– NAD+ (nicotinamide adenine dinucleotide)
– FAD (flavin adenine dinucleotide)» Contain and ADP core
METABOLISM• Principal Compounds of the
Common Catabolic Pathway– Agent for Transfer of Acetyl Groups
• Coenzyme A– Final principal compound – Acetyl (CCH3CO–)-transporting
molecule– Contains ADP
CATABOLISM• Stage I: Hydrolysis of Dietary
Macromolecules into Small Subunits
– To degrade large food molecules into their component subunits• Simple sugars, amino acids, fatty acids,
and glycerol
• Digestive processes
CATABOLISM• Stage II: Conversion of Monomers
into a Form that can be Completely Oxidized– Monosaccharides, amino acids, and
glycerol are assimilated into the pathways of energy metabolism
• Glycolysis• Citric Acid Cycle (Tricarboxylic Acid Cycle
or Kreb’s Cycle)
CATABOLISM• Stage II: Conversion of Monomers
into a Form that can be Completely Oxidized– Sugars – usually enter the glycolysis
pathway in the form of glucose or fructose
– Eventually converted to acetyl-CoA, which can be completely oxidized in the citric acid cycle
CATABOLISM• Stage II: Conversion of Monomers
into a Form that can be Completely Oxidized– Amino groups – are removed from
amino acids– Remaining carbon skeletons enter the
catabolic processes at many steps of the citric acid cycle
CATABOLISM• Stage II: Conversion of Monomers
into a Form that can be Completely Oxidized
– Fatty acids – are converted to acetyl-CoA and enter the citric acid cycle in that form
CATABOLISM• Stage II: Conversion of Monomers
into a Form that can be Completely Oxidized– Glycerol – produced by the hydrolysis
of fats– Converted to glyceraldehyde-3-
phosphate (one of the intermediates of glycolysis)
– Enters energy metabolism
CATABOLISM• Stage III: The Complete Oxidation of
Nutrients and the Production of ATP– Acetyl CoA – carries 2-carbon remnants
of the nutrients, acetyl groups, to the citric acid cycle
– Electrons and hydrogen atoms are harvested during the complete oxidation of the acetyl group to CO2• Used in the process of oxidative
phosphorylation to produce ATP
(1) GLYCOLYSIS• Also known as the Embden-Meyerhof
Pathway• A pathway for carbohydrate catabolism
that begins with the substrate D-glucose– Anaerobic process– 10 steps
– 3 Major Products• ATP – chemical energy• NADH – chemical energy• 2 three-carbon pyruvate
Goodness Gracious, Franklin Did Go By Picking Pumpkins (to) Prepare Pies
ENZYME MNEMONICS
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PENTOSE PHOSPHATE PATHWAY
• An alternative pathway for glucose oxidation
• It provides the cell with energy in the form of reducing power for biosynthesis– NADPH is produced in the oxidative stage
• Reducing agent required for many biosynthetic pathways
• Provides sugar phosphates that are required for biosynthesis
• Most active in tissues involved in cholesterol and fatty acid biosynthesis
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