Chapter 18 Introduction into Metabolism

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Chapter 18Introduction into Metabolism
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Metabolism

• is the sum of all chemical Rx in an organism
• Can be
• Anabolic Rx energy consuming endothermic -Rx
  that build macromolecules for growth/replacement/r
  epair
• Catabolic Rx energy releasing exothermic Rx
  for tissue renewal and in digestion
• Example Cellular Respiration

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Cellular Respiration

• 50 individual Rx sequenced in pathways product
  from Rx 1 is substrate for Rx 2.
• Purpose
• the slow and controlled release of chemical
  energy stored in high energy molecules carbs,
  lipids, proteins
• Example Cellular Respiration of glucose

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Cellular Respiration of Glucose

• Net Rx
• C6H12O6 6 O2 ? 6 CO2 6 H2O 1300 kJ
• Exothermic
• ?H - 1,300 kJ becomes body heat and is
  converted into ATP

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Stages of Digestion

• Stage 1 Digestive System
• Stage 2 Glycolysis
• Stage 3 Citric Acid cycle
• Stage 4 Electron Transport Chain
• Stage 5 ATP Synthesis

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Anatomy of the Digestive System