NPTE Physical Therapist Exam Review

Category - Physical Therapy

Within the myofibril, which of the following is the lighter band that contains only actin?
  1. H zone
  2. M line
  3. A band
  4. I band
Explanation
Answer: D - The lighter band containing only actin within the myofibril is called the I band. The I band region becomes smaller during concentric muscle actions.
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