Flashcard: Muscle Energy Systems and Performance Limitations — 20 carte

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.