ATP hydrolysis — role?
Releases energy for muscle contraction.
Myosin ATPase — function?
Hydrolyzes ATP during contraction.
SERCA pumps — role?
Recapture calcium for muscle relaxation.
ATP resynthesis — process?
Regenerating ATP from ADP via metabolic pathways.
Phosphocreatine — function?
Rapidly donates phosphate to regenerate ATP.
Glycolysis — pathway type?
Anaerobic breakdown of glucose.
Lactate — produced where?
During anaerobic glycolysis.
Aerobic metabolism — requires?
Oxygen in mitochondria.
Energy substrates — main types?
Glucose, fatty acids, amino acids.
Metabolic factors — limit?
Substrate depletion and metabolite accumulation.
Muscle ATP stores — amount?
Limited, enough for a few seconds.
ATP resynthesis — fastest pathway?
Phosphagen system.
Energy contribution — short effort?
Primarily phosphagen and glycolysis.
Energy contribution — sustained effort?
Mostly aerobic metabolism.
Phosphagen pathway — duration?
Up to about 10 seconds.
Anaerobic glycolysis — byproduct?
Lactate and H+ ions.
Lactate — role?
Fuel or recycled in liver.
Aerobic system — capacity?
High, supports long-duration activity.
Energy pathway inertia — meaning?
Delay in activation of pathways.
Metabolic limiting factor?
Lactate accumulation and substrate availability.
Answer 10 questions on Muscle Energy Systems and Performance Limitations.
1. What does muscle ATP consumption refer to?
2. Which enzyme is responsible for catalyzing the transfer of phosphate from phosphocreatine to ADP during ATP resynthesis in muscle?
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