The number of 'A' bands and 'H' zone found in one sarcomere of skeletal muscles respectively is

Options

A. 1 and 2
B. 2 and 2
C. 2 and 1
D. 1 and 1

Answer

To determine the number of 'A' bands and 'H' zones found in one sarcomere of skeletal muscles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sarcomere Structure**:
- A sarcomere is the basic structural and functional unit of skeletal muscle. It is defined as the segment between two Z lines (or Z discs).

2. **Identifying A Band**:
- The A band is the dark band in the sarcomere where both thick (myosin) and thin (actin) filaments overlap.
- In one sarcomere, there is only **one A band** that spans from one Z line to another.

3. **Identifying H Zone**:
- The H zone is a lighter region within the A band where only thick filaments (myosin) are present, and there are no thin filaments (actin).
- Similar to the A band, there is only **one H zone** in a sarcomere.

4. **Conclusion**:
- Therefore, in one sarcomere, the number of A bands is **1**, and the number of H zones is also **1**.

### Final Answer:
The number of 'A' bands and 'H' zones found in one sarcomere of skeletal muscles respectively is **1 and 1**.

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