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The microscopic anatomical arrangement of the skeletal muscles is a hierarchy of functional units that work together in the process of muscle contraction. A skeletal muscle cell (fiber) consists of an arrangement of myofibrils and myofilaments that interact with various other proteins in the process of muscle cell contraction. Figure 12.2, on page 187 of your textbook, shows the relationship of the sarcoplasmic reticulum and T-tubules to the myofibrils of skeletal muscle.

The overall learning objective for Week 6 in the laboratory course is to identify and describe the superficial muscles on your body as well as the movement they produce. To successfully complete this assignment, first read the following exercise from the Laboratory Manual: Exercise 12: Microscopic Anatomy and Organization of Skeletal Muscle.

Student Discussion Assignment

  1. Describe the banding pattern of a myofibril, including the Z-disc, H-zone, I-band, A-band, and M-line.
  2. Describe the structure of a neuromuscular junction and explain its role in the control of muscle function.

Write your responses in a minimum of 250 words in APA format and include your references.


Marieb, E. N., Smith, L. A. (2016). Human Anatomy & Physiology Laboratory Manual, Fetal Pig Version, 12th Edition. [South University]. Retrieved from…

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