CH5.8 Muscular System Diseases & Disorders

Multiple Choice

Which of the following is NOT a common cause of muscle strains?

• Improper use of muscles

• Fatigue

• Genetic mutation

• Overuse

Multiple Select

Which of the following are characteristics of a Grade III muscle strain? (select all that apply)

• Complete loss of muscle function

• Mild pain and tenderness

• Muscle torn completely through

• Noticeable loss of strength

Open Ended

Compare the progression of Duchenne and Becker muscular dystrophy. How do differences in dystrophin production explain their distinct clinical outcomes? Some research may be needed.

Open Ended

Review the stages of muscle strain recovery. What factors could delay healing and increase the risk of re-injury? Some additional research may be necessary.

Open Ended

Evaluate why Duchenne muscular dystrophy results in a significantly lower life expectancy than Becker muscular dystrophy. Include both physiological and systemic effects in your explanation. Some research may be necessary.

Open Ended

A patient insists on continuing intense strength training despite recurring mild muscle strains. Assess the potential long-term impact on their muscular health. Some research may be necessary.

Multiple Choice

A basketball player reports sharp pain and swelling after an abrupt sprint. The physician notes a partial tear with mild bruising and decreased strength. Which classification best fits this injury?

• Grade I – Mild strain

• Grade II – Moderate strain

• Grade III – Severe strain

• Chronic muscle fatigue

Multiple Choice

Which of the following best explains why Duchenne muscular dystrophy is more severe than Becker muscular dystrophy?

• Becker affects both skeletal and smooth muscle.

• Duchenne completely lacks functional dystrophin, while Becker retains partial function.

• Becker occurs only in females.

• Duchenne involves mitochondrial defects rather than gene mutations.

Multiple Choice

A physical therapist designs a gradual stretching program for a patient recovering from a Grade II muscle strain. What is the primary physiological reason for beginning with light activity?

• It increases scar tissue formation for protection.

• It promotes blood flow and collagen repair without overloading damaged fibers.

• It prevents the muscle from regaining its previous length.

• It accelerates inflammation to speed up healing.

Multiple Choice

Which reasoning best explains the X-linked recessive inheritance pattern of Duchenne muscular dystrophy?
a. Both male and female children have equal chances of inheriting the disorder.

• Affected males pass the mutation directly to their sons.

• Males express the disorder because they inherit only one X chromosome carrying the mutation.

• Affected males pass the mutation directly to their sons.

• Females cannot be carriers because they have two X chromosomes.

Multiple Choice

Evaluate the following scenario: A 15-year-old with Becker muscular dystrophy continues to walk unassisted but experiences fatigue and mild cardiac symptoms. Which intervention is most appropriate?

• Encourage full physical rest to prevent strain.

• Implement moderate, low-impact exercise with cardiac monitoring.

• Begin intensive strength training to build muscle mass.

• Discontinue all physical activity to avoid dystrophin breakdown.