NBCSN Nationally Certified School Nurse Practice Exam 2025 - Free School Nurse Certification Practice Questions and Study Guide

Muscular dystrophy is primarily characterized by the degeneration of muscle, which is a critical aspect of the condition. This progressive muscle weakness and eventual loss of muscle mass occurs due to genetic mutations that affect the proteins necessary for healthy muscle function. As the disease advances, individuals experience a decline in strength and mobility, leading to significant physical disabilities.

In contrast, joint stiffness is not a defining feature of muscular dystrophy, although individuals may experience secondary joint problems due to muscle weakness. Increased muscle mass would not occur in this condition; rather, muscle tissue deteriorates, leading to a reduction in muscle fibers. Hyperactivity is also unrelated to muscular dystrophy; individuals may actually display reduced movement and activity levels because of muscle weakness. The focus on muscle degeneration accurately reflects the underlying pathology and symptoms associated with muscular dystrophy.