Is the force contraction of muscle fibre dependent on the strength of stimulus

Explanation

### Step-by-Step Solution:

1. **Understanding Muscle Contraction**: Muscle fibers contract in response to stimuli. The contraction can either occur or not occur based on the strength of the stimulus.

2. **All or None Rule**: Muscle fibers operate under the "all or none" principle. This means that a muscle fiber will either fully contract or not contract at all, depending on whether the stimulus meets a certain threshold.

3. **Threshold Stimulus**: The threshold stimulus is the minimum level of stimulus required to trigger a contraction in the muscle fiber. If the stimulus is below this threshold, the muscle fiber will not contract.

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