Read the following statements is context to muscle tissue and choose the correct answer .
(i) Excessive exercise results in anaerobic Respiration and forms lactic acid .
(ii) As per sliding filament theory of muscle contraction, the filament that moves to shorten a muscule is actin .
(iii) The muscles primarily involved in locomotion is striated muscles .

Options

A. i and ii only
B. ii and iii only
C. i and iii only
D. i , ii and iii only

Answer

To solve the question regarding muscle tissue, we need to analyze each statement provided and determine whether they are correct or incorrect.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- **Statement**: "Excessive exercise results in anaerobic respiration and forms lactic acid."
- **Analysis**: During excessive exercise, the body may not have enough oxygen to meet energy demands. As a result, glucose undergoes anaerobic respiration, leading to the production of lactic acid.
- **Conclusion**: This statement is **correct**.

2. **Evaluate Statement (ii)**:
- **Statement**: "As per sliding filament theory of muscle contraction, the filament that moves to shorten a muscle is actin."
- **Analysis**: According to the sliding filament theory, muscle contraction occurs when myosin filaments slide over actin filaments. It is the myosin that moves to pull the actin, thus shortening the muscle.
- **Conclusion**: This statement is **incorrect**.

3. **Evaluate Statement (iii)**:
- **Statement**: "The muscles primarily involved in locomotion are striated muscles."
- **Analysis**: Striated muscles, also known as skeletal muscles, are indeed the muscles primarily responsible for locomotion and voluntary movements.
- **Conclusion**: This statement is **correct**.

### Summary of Findings:
- Statement (i): **Correct**
- Statement (ii): **Incorrect**
- Statement (iii): **Correct**

### Final Answer:
The correct statements are (i) and (iii). Therefore, the answer is option **4: 1 and 3**.