Question

which of the following best describes the m line found within sarcomeres?
o the m line is between the a band and the i band is the attachment point for the thin filaments.
o the m line is found dividing two adjacent sarcomeres.
o the m line is found between the i band and the z line and serves as an attach - ment point for the titin proteins.
o the m line is in the middle of the h zone and contains proteins that help hold the thick filaments in place.

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Explanation:

The M - line is located in the middle of the H - zone of a sarcomere. It contains proteins such as myomesin that serve to hold the thick filaments (myosin filaments) in place. The Z - line divides two adjacent sarcomeres. The thin filaments (actin filaments) are attached at the Z - line.

Answer:

The M line is in the middle of the H zone and contains proteins that help hold the thick filaments in place.