-What Is the Structure Indicated by the Number 6 in Figure

question 70

Multiple Choice

-What is the structure indicated by the number 6 in Figure 12.1 and what is its functional significance?

• A) sarcomere : the functional unit of muscle contraction whose length is changed as a muscle shortens and lengthens
• B) H zone : area of myosin not overlapped by actin
• C) Z line : anchors the thin filaments together
• D) A band : length of myosin attached to an M line
• E) I band : area of actin not having a crossbridge

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