OCR A2 PE Exercise Physiology

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Energy
Ability to perform work - Joules (J)
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Work
Work = Force (N) x Distance (m) - Joules (J)
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Power
Rate at which we can work - Watts (W)
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Adenosine Triphosphate (ATP)
Chemical energy stored as a high energy compound in the body. Only usuable source of energy. It is stored directly in the muscles and can supply energy for up to 3 seconds.
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Breaking down ATP
Broken by the enzyme ATPase, it releases potential energy exothermically stored within the high energy bonds to provide energy for muscular contractions. It is broken down into ADP + P + energy.
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Kinetic energy
Energy in the form of joint movement.
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Exothermic
Chemical reaction that releases energy.
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Endothermic
Chemical reaction that requires energy to be added for it to take place.
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Coupled reaction
Products from one reaction, such as energy, are then used in another reaction.
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ATP resynthesis
Breakdown of ATP into ADP is a reversible reaction. It requires energy endothermically from one of the energy systems to resynthesise ADP back into ATP, via coupled reactions.
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ATP/PC system
Anaerobic | Fuel: ATP and PC | Site: Sarcoplasm | Enzymes: ATPase / creatine kinase | PC>C+Pi = E | Energy used to resynthesise ADP into ATP | Net total of 1 ATP.
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LA System
Anaerobic | Fuel: Glucose | Site: Sarcoplasm | Enzymes: PFK / LDH | Glucose to pyruvic acid + energy > PA > LA | LA > Low pH which causes enzymes to denature | Net total of 2 ATP.
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Aerobic Glycolysis (Aerobic System)
Aerobic | Fuel: Glucose | Site: Sarcoplasm | Enzymes: PFK | Glucose to pyruvic acid + energy > PA + coenzyme A > Acetyl coenzyme A + Oxaloacetic acid > citric acid | LA > Low pH which causes enzymes to denature | Net total of 2 ATP.
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Other cards in this set

Card 2

Front

Work

Back

Work = Force (N) x Distance (m) - Joules (J)

Card 3

Front

Power

Back

Preview of the front of card 3

Card 4

Front

Adenosine Triphosphate (ATP)

Back

Preview of the front of card 4

Card 5

Front

Breaking down ATP

Back

Preview of the front of card 5
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