Question:
The immediate chemical source of energy for muscle contraction is:
The immediate chemical source of energy for muscle contraction is:
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Always distinguish between direct energy and storage energy in muscles:
- Direct and immediate energy source = ATP.
- Storage backup energy reservoir = Creatine Phosphate.
- Direct and immediate energy source = ATP.
- Storage backup energy reservoir = Creatine Phosphate.
Updated On: Jun 3, 2026
- Actin
- Myosin
- ATP
- Creatine Phosphate
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the immediate, direct biochemical molecule that supplies energy to power the sliding filament mechanism of muscle contraction.
Step 2: Detailed Explanation:
• Muscle contraction operates via the sliding filament theory, which involves actin (thin filaments) and myosin (thick filaments) sliding past each other.
• The head of the myosin molecule contains an active site with ATPase enzymatic activity, which can bind and hydrolyze adenosine triphosphate (ATP).
• During the contraction cycle, the binding of ATP to the myosin head is required to release myosin from actin.
• The subsequent hydrolysis of this ATP molecule into adenosine diphosphate (ADP) and an inorganic phosphate ($\text{P}_i$) releases free energy, which alters the conformation of the myosin head into a high-energy "cocked" state.
• This energized head binds to actin, forms a cross-bridge, and performs the "power stroke" to slide the actin filament. Thus, ATP is the direct and immediate chemical energy donor for this cross-bridge cycle.
• While Creatine Phosphate (D) is a highly concentrated energy reserve in muscle tissue, it cannot be utilized directly by the contractile proteins. Instead, creatine phosphate must transfer its high-energy phosphate group to ADP to regenerate ATP via the enzyme creatine kinase.
• Actin (A) and Myosin (B) are structural, contractile proteins that participate in the movement but do not act as energy molecules themselves.
Step 3: Final Answer:
The immediate chemical source of energy for muscle contraction is ATP (Adenosine Triphosphate).
The question asks to identify the immediate, direct biochemical molecule that supplies energy to power the sliding filament mechanism of muscle contraction.
Step 2: Detailed Explanation:
• Muscle contraction operates via the sliding filament theory, which involves actin (thin filaments) and myosin (thick filaments) sliding past each other.
• The head of the myosin molecule contains an active site with ATPase enzymatic activity, which can bind and hydrolyze adenosine triphosphate (ATP).
• During the contraction cycle, the binding of ATP to the myosin head is required to release myosin from actin.
• The subsequent hydrolysis of this ATP molecule into adenosine diphosphate (ADP) and an inorganic phosphate ($\text{P}_i$) releases free energy, which alters the conformation of the myosin head into a high-energy "cocked" state.
• This energized head binds to actin, forms a cross-bridge, and performs the "power stroke" to slide the actin filament. Thus, ATP is the direct and immediate chemical energy donor for this cross-bridge cycle.
• While Creatine Phosphate (D) is a highly concentrated energy reserve in muscle tissue, it cannot be utilized directly by the contractile proteins. Instead, creatine phosphate must transfer its high-energy phosphate group to ADP to regenerate ATP via the enzyme creatine kinase.
• Actin (A) and Myosin (B) are structural, contractile proteins that participate in the movement but do not act as energy molecules themselves.
Step 3: Final Answer:
The immediate chemical source of energy for muscle contraction is ATP (Adenosine Triphosphate).
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