The muscular contraction was explained by the sliding filament theory, which was proposed by Huxley and Hansen in 1954. Actin and myosin are the two types of proteins found in the muscle fiber. During contraction, the myosin molecules move along the actin molecules. This process requires the expenditure of energy, which is provided by phosphorylation of adenosine diphosphate (ADP) to ATP (adenosine triphosphate).

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Chapter 45, Problem 2TYK

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The muscular contraction was explained by the sliding filament theory, which was proposed by Huxley and Hansen in 1954. Actin and myosin are the two types of proteins found in the muscle fiber. During contraction, the myosin molecules move along the actin molecules. This process requires the expenditure of energy, which is provided by phosphorylation of adenosine diphosphate (ADP) to ATP (adenosine triphosphate).

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