What is the part of a sarcomere that contains only thin filaments?Multiple choice question.A bandZ lineI bandH band

Breakdown the Problem

1. Identify the components of a sarcomere.
2. Determine which part contains only thin filaments.

Relevant Concepts

The sarcomere is the basic contractile unit of muscle tissue, and it consists of various regions:

• A band: The dark band that contains both thick and thin filaments.
• I band: The light band that contains only thin filaments.
• H band: The region within the A band that contains only thick filaments.
• Z line: The boundary of a sarcomere where thin filaments are anchored.

Analysis and Detail

• The I band is the region that contains only the thin filaments, which are composed of actin proteins. This is the segment that appears lighter under a microscope since it does not contain thick filaments (myosin).

Verify and Summarize

After reviewing the definitions of the parts of a sarcomere, it is confirmed that the I band is indeed the area that consists solely of thin filaments.

Final Answer

The part of a sarcomere that contains only thin filaments is the I band.