Find the correct statement with regard to the arrangement of myosin molecules in a sarcomere

Options

A. All the tails face towards 'M' line
B. All the heads face towards 'M' line
C. Half of the heads towards one 'M' line
D. Half of the heads towards one 'Z' line and other half towards 'M' line

Answer

To find the correct statement regarding the arrangement of myosin molecules in a sarcomere, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Sarcomere**:
- A sarcomere is the smallest functional unit of striated muscle tissue. It consists of various regions including the A band, I band, H zone, and M line.

2. **Identify Key Components**:
- The M line is located in the center of the H zone, which is the area where myosin filaments are present.

3. **Arrangement of Myosin Molecules**:
- Myosin molecules consist of a tail and a head. In a sarcomere, the tails of the myosin molecules are aligned towards the M line, while the heads extend away from the M line.

4. **Evaluate the Options**:
- **Option 1**: "All the tails face towards M line" - This is correct as the tails of myosin molecules do face the M line.
- **Option 2**: "All the heads face towards M line" - This is incorrect as the heads face away from the M line.
- **Option 3**: "Half of the heads towards one M line and half of the heads towards one Z line" - This is also incorrect as the heads do not orient in this manner.
- **Option 4**: "The other half towards M line" - This is incorrect as well.

5. **Conclusion**:
- The correct statement regarding the arrangement of myosin molecules in a sarcomere is that **all the tails face towards the M line**.