Introduction to Energy Systems. A note about labs Bench press bar = 10 kg Need to go through and...
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Transcript of Introduction to Energy Systems. A note about labs Bench press bar = 10 kg Need to go through and...
Introduction to Energy Systems
A note about labs Bench press bar = 10 kg Need to go through and complete bothe the
results and questions for the lab, and Fitness prescription for your “athlete” Next week carb loaders
WebCT Discussion boards Week 2
Links Lectures
Today Focus on
What is energy How is food energy Basics catabolism and anabolism Anaerobic synthesis ATP Aerobic synthesis ATP
Types of energy
•Chemical
•Mechanical
•Heat
•Light
•Electric
•Nuclear
Laws of ThermodynamicsLaws of Thermodynamics
energy transfer always proceeds in the direction of increased entropy and the release of free energy
1- Energy cannot be created or destroyed Chemical energy
mechanical energy
DefinitionsDefinitions
Enzymes Highly specific protein catalysts Accelerate the forward and reverse reactions Are neither consumed nor changed in the reaction
Coenzymes Complex nonprotein organic substances facilitate enzyme action by binding the substrate with
its specific enzyme
Catabolism :
Metabolic pathways that break down molecules into smaller units and release energy
Catabolism and Anabolism
+
Overview of CatabolismGlucoseFFA’s Amino acids
glycolysis
mitochondria
-oxidation
TCACycle
deamination
NH2
NADH + H+
FADH + H+CO2
Acetyl CoA
Electron Transport
Chain
Figure 3.4, simplified
Anabolism
Covalent bonding of electrons, protons and small molecules to produce larger molecules building up
- Catabolism and anabolism function in a dynamic balance.
Anna
Adenosine Triphosphate
Powers all of cell’s energy-requiring processes
Potential energy extracted from food
Energy is stored in
bonds of ATP 80-100g is stored
Adenosine Diphosphate ADP is ATP minus one phosphate group 14 calories of energy is released each time
ATP ADP
Remember the Spare Phosphate??
The Spare P that was released from ATP ADP hooks up with Creatine to form …
Creatine Phosphate (CrP)
Cells store ~ 4 – 6 times more PCr than ATP
ATP-PC system Anaerobic resynthesis of
ATP- 5-8 seconds of energy Hydrolyzed by the enzyme,
creatine kinase ADP is phosphorylated to
ATP Creatine may be
phosphorylated back to PCr
Citric Acid Cycle Also known as the TCA cycle, or Krebs
cycle Continues oxidation of
Carbohydrates following glycolysis Fatty acids following beta oxidation Some amino acids following deamination
Summary Energy is never created nor destroyed. Complex chemical process synthesize
glucose/ glycogen from our foods Stored as glycogen if not needed Anaerobic ATP-PC system Aerobic Citric acid/ Kreb’s cycle