Question

multiple choice question

what characteristic of a muscle cell allows it to repair mild injuries caused by exercise?

many nuclei
abundant smooth er
many myoglobin molecules

Explanation:

Analyze the question and options

The question asks which characteristic of a muscle cell allows it to repair mild injuries caused by exercise. Let's evaluate the options:

• Many nuclei: Skeletal muscle fibers are multinucleated. This abundance of nuclei (and the associated satellite cells) provides the genetic machinery, transcription capacity, and protein synthesis capability necessary to repair damaged contractile proteins and cellular structures after mild exercise-induced injury.
• Abundant smooth ER: In muscle cells, the smooth endoplasmic reticulum is specialized as the sarcoplasmic reticulum, which functions primarily in calcium storage and release for contraction, not direct structural repair.
• Many myoglobin molecules: Myoglobin binds and stores oxygen within the muscle cell to facilitate aerobic respiration.

Relate to muscle repair mechanisms

Using the Muscle Regeneration knowledge point
Skeletal muscle cells are large, elongated, and multinucleated. The presence of multiple nuclei within a single muscle fiber allows for localized transcription and rapid protein synthesis of actin, myosin, and other structural components needed to repair microtears resulting from exercise.

Using the Myoglobin Function knowledge point
While myoglobin is crucial for oxygen storage and transport during muscle activity, it does not directly coordinate or perform the cellular repair processes.

Answer:

• Many nuclei (Correct answer)
• Abundant smooth ER
• Many myoglobin molecules