CVS Practice Test

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In a relaxed muscle, what is the state of the H zone and I bands?

At maximum width

In a relaxed muscle, the state of the H zone and I bands can be described in terms of their width and presence. When a muscle is in a relaxed state, the filaments responsible for muscle contraction (actin and myosin) are not fully engaged, allowing for greater separation between them.

The H zone, which is the area within the A band that contains only myosin filaments, is at its maximum width during relaxation because there is less overlap with actin filaments. This increased spacing creates a wider gap.

Similarly, the I band, which contains only actin filaments and is situated on either side of the Z line, is also at its maximum width in a relaxed muscle state due to the same principle of minimal overlap between actin and myosin filaments.

Thus, the correct answer reflects that both the H zone and I bands are at their maximum widths in a relaxed muscle, facilitating a physiological state that prepares the muscle for contraction when needed.

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Completely absent

Narrower than during contraction

Nonexistent

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