Question

this muscular injury may vary in severity from localized cellular injury to complete rupture of the muscle belly/tendon. strain sprain tendinitis myasthenia gravis

Explanation:

A strain is a muscular - tendon injury that can range from mild cellular damage to complete rupture. A sprain is a ligament injury. Tendinitis is inflammation of a tendon. Myasthenia gravis is an autoimmune neuromuscular disease.

Answer:

Strain