Final answer:
Denervation, spinal cord injury, and immobilization can cause a muscle to be 'silent' due to nerve damage, interrupted nerve impulses, and muscle atrophy.
Explanation:
Denervation, spinal cord injury, and immobilization can all result in a completely 'silent' muscle due to various reasons such as nerve damage, interruption of nerve impulses, and muscle atrophy. Denervation involves the loss of nerve supply to a muscle, while spinal cord injuries can lead to paralysis affecting movement and sensation. Immobilization, whether due to injury or inactivity, can cause muscle weakening and atrophy.
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