Question

the ______ of a sarcomere is composed primarily of actin.
o z line
o h zone
o i band
o a band
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Explanation:

The I - band of a sarcomere is composed primarily of actin. The Z - line is a structure that defines the boundaries of a sarcomere. The H - zone contains only myosin and is in the center of the A - band. The A - band contains both actin and myosin. Actin is a major component of the I - band.

Answer:

C. I band