"All or none" rule cannot be implicated on

Options

A. Non-striated muscles
B. Cardiac muscle
C. Striated muscles
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the All or None Rule**: The all or none rule states that when a muscle fiber receives a stimulus that meets or exceeds a certain threshold, it will contract fully. If the stimulus is below this threshold, there will be no contraction at all.

2. **Identifying Muscle Types**: The question presents four options: non-striated muscles, cardiac muscles, striated muscles, and all of the above. We need to analyze how the all or none rule applies to each type.

3. **Application to Non-Striated Muscles**: Non-striated muscles (smooth muscles) typically follow the all or none rule at the level of individual fibers. When a smooth muscle fiber receives a sufficient stimulus, it contracts fully.

4. **Application to Cardiac Muscles**: Cardiac muscles also adhere to the all or none principle at the level of individual muscle fibers. When stimulated, cardiac muscle fibers contract completely.

5. **Application to Striated Muscles**: Striated muscles (skeletal muscles) operate differently. While individual muscle fibers follow the all or none rule, the entire muscle can exhibit graded contractions. This means that as the strength of the stimulus increases, more motor units are recruited, leading to a gradual increase in muscle contraction until a maximum contraction is reached.

6. **Conclusion**: The all or none rule cannot be applied to the entire muscle in the case of striated muscles because they can exhibit graded responses based on the strength of the stimulus.

7. **Final Answer**: The all or none rule cannot be implicated on striated muscles when considering the whole muscle.