One of the three important muscle tissues in the human body is found in the skeleton. Thousands of muscle fibers are encased in connective tissue sheaths to form each skeletal muscle. Fasciculi are the individual bundles of muscle fibers found within skeletal muscles
These pathways include the breakdown of muscle glycogen and phosphocreatine, which allows for substrate-level phosphorylation (also known as "anaerobic") and oxidative phosphorylation using reducing equivalents from the metabolism of carbohydrates and fats (also known as "aerobic").
ATP must be replenished at a rate that is compatible with ATP demand in order to maintain muscle contraction. To refuel ATP in muscle, three energy systems work: phosphoglycation, glycolysis, and mitochondrial respiration.
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