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H' zone is...

H' zone is

A

Outer part of A band with overlapping thick and thin filaments

B

A part of I band with overlapping thick and thin filaments

C

Central part of A band with only thick filaments

D

Central part of I band with only thin filaments

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Sarcomere Structure**: The sarcomere is the basic functional unit of striated muscle tissue. It is composed of thick and thin filaments that slide past each other to produce muscle contraction. 2. **Identifying Filaments**: In a sarcomere, the thick filaments are primarily made of myosin, while the thin filaments are primarily made of actin. 3. **Defining the Bands**: - **I Band**: This is the region that contains only thin filaments (actin). - **A Band**: This region contains both thick (myosin) and thin (actin) filaments. The A band is where the thick and thin filaments overlap. - **H Zone**: This is the central part of the A band where only thick filaments (myosin) are present, without any overlapping thin filaments. 4. **Identifying the Z Line**: The Z line is the boundary between adjacent sarcomeres and is located at the center of the I band. 5. **Conclusion**: The H zone is specifically defined as the central part of the A band where only thick filaments (myosin) are present. 6. **Correct Answer**: The H zone is the central part of the A band with only thick filament.
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