Question

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

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

Answer:

B. I band