Which statement is correct about the disorder of skeletal or muscular system?

Options

A. Muscular dystrophy - Age - related shroteining of muscles
B. Osteoporosis - Decrease in bone mass and a higher chance of fractures with advancing age
C. Myasthenia gravis - Autommue disorder which inhibits sliding of myosin filaments
D. Gout - inflammation of joints due to extra deposition of calcium

Answer

To determine the correct statement about disorders of the skeletal or muscular system, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Evaluate the first statement about Muscular Dystrophy**:
- The statement claims that muscular dystrophy is an age-related shortening of muscles.
- **Analysis**: Muscular dystrophy is not related to age; it is a genetic disorder that leads to the degeneration of skeletal muscles. Therefore, this statement is **incorrect**.

2. **Evaluate the second statement about Osteoporosis**:
- The statement mentions that osteoporosis involves a decrease in bone mass with age, leading to an increased risk of fractures.
- **Analysis**: This is true. Osteoporosis is characterized by a reduction in bone density and strength, making bones more susceptible to fractures, especially in postmenopausal women. Thus, this statement is **correct**.

3. **Evaluate the third statement about Myasthenia Gravis**:
- The statement suggests that Myasthenia Gravis inhibits the sliding of myosin filaments.
- **Analysis**: Myasthenia Gravis is an autoimmune disorder that affects the neuromuscular junction, leading to muscle weakness and fatigue, but it does not inhibit the sliding of myosin filaments directly. Therefore, this statement is **incorrect**.

4. **Evaluate the fourth statement about Gout**:
- The statement claims that gout is an inherited disorder of purine metabolism, causing joint inflammation due to calcium deposition.
- **Analysis**: Gout is indeed related to purine metabolism, but it is characterized by the deposition of uric acid crystals in the joints, not calcium. Therefore, this statement is **incorrect**.

### Conclusion:
The only correct statement regarding disorders of the skeletal or muscular system is the second statement about osteoporosis.

### Final Answer:
**The correct statement is about Osteoporosis: bone mass decreases with age, increasing the chances of fractures.**

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