- A A genetic muscle disease that causes slow, progressive muscle weakness over time
- B Inflammation or degeneration of joints causing pain and stiffness
- C A fracture of one of the long bones, usually caused by trauma or a fall
- D A nerve disease that specifically affects motor neuron signaling pathways
Correct answer: B. Inflammation or degeneration of joints causing pain and stiffness
Explanation: Arthritis is inflammation and/or degeneration of joints. Rheumatoid arthritis: autoimmune, affects synovial membrane. Osteoarthritis: wear-and-tear degeneration of cartilage, most common in elderly. Both cause pain, stiffness, and reduced movement.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.