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An area between two Z lines forms...

An area between two Z lines forms

A

A band

B

I band

C

H band

D

sarcomere

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Structure of Striated Muscle:** - Striated muscles are composed of long muscle fibers that contain myofibrils. These myofibrils are organized into repeating units known as sarcomeres. 2. **Identifying Z Lines:** - The Z line (or Z disc) is a structure that marks the boundaries of a sarcomere. It is where the thin filaments (actin) are anchored. 3. **Determining the Area Between Two Z Lines:** - The area between two Z lines is crucial because it defines the sarcomere. Each sarcomere contains both thick (myosin) and thin (actin) filaments. 4. **Recognizing the Components of a Sarcomere:** - Within a sarcomere, there are different bands: - **A Band:** The dark band that contains the thick filaments (myosin) and overlaps with thin filaments. - **I Band:** The light band that contains only thin filaments (actin). - **H Zone:** The central part of the A band where there is no overlap between thick and thin filaments. 5. **Conclusion:** - Therefore, the area between two Z lines forms a **sarcomere**, which is the basic structural and functional unit of striated muscle. **Final Answer:** The area between two Z lines forms a **sarcomere**. ---
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