### Analysis of the Question
Muscle contraction is a complex physiological process that requires energy. Each of the provided options plays a role in the mechanism of muscle contraction.

1. **Actin**: A protein that forms thin filaments in muscle fibers and is crucial for contraction, but it does not supply energy.
2. **Myosin**: A motor protein that interacts with actin to produce force and movement during contraction, but it requires energy to function.
3. **Tropomyosin**: A protein that blocks the interaction between actin and myosin when muscles are relaxed, not directly providing energy.
4. **ATP**: Adenosine triphosphate is the primary energy carrier in all living cells, including muscle cells. It provides the energy required for muscle contraction.
5. **Ca²⁺**: Calcium ions play a key role in initiating muscle contraction by binding to troponin, which causes tropomyosin to move and allow myosin to bind to actin, but they do not supply energy directly.

### Final Answer
The correct answer is **ATP**. It is the molecule that supplies the necessary energy for muscle contraction.

Question

### Analysis of the Question
Muscle contraction is a complex physiological process that requires energy. Each of the provided options plays a role in the mechanism of muscle contraction.

1. **Actin**: A protein that forms thin filaments in muscle fibers and is crucial for contraction, but it does not supply energy.
2. **Myosin**: A motor protein that interacts with actin to produce force and movement during contraction, but it requires energy to function.
3. **Tropomyosin**: A protein that blocks the interaction between actin and myosin when muscles are relaxed, not directly providing energy.
4. **ATP**: Adenosine triphosphate is the primary energy carrier in all living cells, including muscle cells. It provides the energy required for muscle contraction.
5. **Ca²⁺**: Calcium ions play a key role in initiating muscle contraction by binding to troponin, which causes tropomyosin to move and allow myosin to bind to actin, but they do not supply energy directly.

### Final Answer
The correct answer is **ATP**. It is the molecule that supplies the necessary energy for muscle contraction.

Knowee AI · Accepted Answer

### Analysis of the Question
Muscle contraction is a complex physiological process that requires energy. Each of the provided options plays a role in the mechanism of muscle contraction.

1. **Actin**: A protein that forms thin filaments in muscle fibers and is crucial for contraction, but it does not supply energy.
2. **Myosin**: A motor protein that interacts with actin to produce force and movement during contraction, but it requires energy to function.
3. **Tropomyosin**: A protein that blocks the interaction between actin and myosin when muscles are relaxed, not directly providing energy.
4. **ATP**: Adenosine triphosphate is the primary energy carrier in all living cells, including muscle cells. It provides the energy required for muscle contraction.
5. **Ca²⁺**: Calcium ions play a key role in initiating muscle contraction by binding to troponin, which causes tropomyosin to move and allow myosin to bind to actin, but they do not supply energy directly.

### Final Answer
The correct answer is **ATP**. It is the molecule that supplies the necessary energy for muscle contraction.

What supplies the energy for muscle contraction?Multiple ChoiceactinmyosintropomyosinATPCa2+

Question

What supplies the energy for muscle contraction?

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Analysis of the Question

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