Question

which statement describes the z line that is seen within striations of skeletal muscle?

o direct attachment for the thin filaments; bisects the a band
o direct attachment for the thick filaments; bisects the h zone
o direct attachment for the thick filaments; bisects the a band
o direct attachment for the thin filaments; bisects the i band

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Explanation:

In skeletal - muscle striations, the Z - line is the direct attachment for the thin filaments (actin filaments). It bisects the I - band. The I - band contains only thin filaments, and the Z - line runs through its center. The A - band contains both thick and thin filaments, and is not bisected by the Z - line. The H - zone is in the middle of the A - band and contains only thick filaments and is not where the Z - line is located.

Answer:

Direct attachment for the thin filaments; bisects the I band