Choose the wrong matched pair

Options

A. Isotropic band-Actin
B. Anisotropic band-Myosin
C. Central part of A band -H-zone
D. Central part of A-band -M-line.

Answer

To solve the question of identifying the wrong matched pair, we will analyze each option step by step:

### Step 1: Analyze the first option - Isotropic band and Actin
- The isotropic band, also known as the I band, is indeed associated with actin filaments.
- The I band is a light band in skeletal muscle.
- **Conclusion:** This is a correct match.

### Step 2: Analyze the second option - Anisotropic band and Myosin
- The anisotropic band, also known as the A band, is associated with myosin filaments.
- The A band is a dark band in striated muscle and contains thick myosin filaments.
- **Conclusion:** This is a correct match.

### Step 3: Analyze the third option - Central part of A band is H zone
- The H zone is the central part of the A band and is where there is no overlap with actin filaments.
- The A band is made up of myosin filaments, and the H zone is indeed the central area that does not overlap with actin.
- **Conclusion:** This is a correct match.

### Step 4: Analyze the fourth option - Central part of A band is M line
- The M line is a structure that runs down the center of the A band, but it is not the central part of the A band itself.
- The central part of the A band is the H zone, not the M line.
- **Conclusion:** This is the incorrect match.

### Final Answer:
- The wrong matched pair is **Option 4: Central part of A band is M line**.

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