Question

within a sarcomere, what is the h zone?
o the portion of the i band closest to the z line
o the region within the a band that lacks thick filaments
o the region within the a band that lacks thin filaments
o the distance between two adjacent z lines

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Explanation:

The H - zone is located within the A - band of a sarcomere. It is the region where there are only thick filaments (myosin) and no thin filaments (actin).

Answer:

The region within the A band that lacks thin filaments