Question 1

What is the difference between musculoskeletal and neuromuscular disorders?

Accepted Answer

Musculoskeletal disorders involve injuries to skeletal muscles and connective tissues from biomechanical stresses, accidents, or overuse, affecting localized areas. Neuromuscular disorders affect neurons controlling voluntary muscles or muscle-neuron interactions, typically have genetic causes, and impact most or all muscles in the body.

Question 2

How do muscle strains differ from tendonitis?

Accepted Answer

Muscle strains result from sudden events like accidental slipping or intense exercise, causing direct damage to muscle fibers. Tendonitis develops from repetitive movements, such as overuse of the knee and wrist in athletes, causing inflammation of the local tendons rather than muscle fiber damage.

Question 3

What causes Duchenne muscular dystrophy and how does it affect muscles?

Accepted Answer

Duchenne muscular dystrophy results from genetic mutations affecting the dystrophin protein, which maintains muscle cell structural integrity. Dystrophin deficiency compromises muscle fiber stability and strength, leading to progressive muscle degeneration, weakness, and gradual loss of muscle mass throughout the body.

Question 4

How does myasthenia gravis disrupt muscle function?

Accepted Answer

Myasthenia gravis is an autoimmune disease where the immune system produces antibodies that block acetylcholine receptors at the neuromuscular junction. This prevents nerve signals from reaching muscles, resulting in muscle weakness, drooping eyelids, difficulty swallowing, and impaired voluntary muscle control.

Question 5

What are common causes of musculoskeletal injuries?

Accepted Answer

Musculoskeletal injuries arise from biomechanical stresses including accidental events like slipping, intense physical activity, and overuse. Mundane activities such as excessive walking, prolonged sitting, and lifting objects can also injure muscles or tendons, particularly when combined with repetitive movements or improper technique.

Question 6

Why do neuromuscular disorders typically affect multiple muscles?

Accepted Answer

Neuromuscular disorders have genetic causes and disrupt the neurons controlling voluntary muscles or the interactions between muscles and neurons. Since these neurons innervate most or all skeletal muscles throughout the body, genetic defects affect muscle function broadly rather than in isolated regions.

Question 7

What role does the dystrophin protein play in muscle health?

Accepted Answer

Dystrophin maintains the structural integrity and stability of muscle cells. When dystrophin is deficient or absent due to genetic mutation, muscle fibers lose structural support, become unstable, and undergo progressive degeneration, leading to the weakness and muscle loss characteristic of Duchenne muscular dystrophy.

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