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A sarcomere comsists of...

A sarcomere comsists of

A

One A-band and one I-band

B

HalfA band and two half I -band

C

Half A -band and one I- band

D

One A -band and two half I -band

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Definition of Sarcomere**: A sarcomere is defined as the basic contractile unit of muscle fibers. It is the smallest functional unit of muscle tissue that can contract. 2. **Composition of Sarcomere**: The sarcomere is made up of long fibrous proteins known as filaments. These filaments slide past each other during muscle contraction and relaxation. 3. **Types of Filaments**: There are two main types of contractile proteins in a sarcomere: - **Myosin**: This protein forms the thick filaments. Myosin heads interact with actin to facilitate muscle contraction. - **Actin**: This protein forms the thin filaments. Actin provides a binding site for myosin heads during muscle contraction. 4. **Arrangement of Bands**: In a sarcomere, there are distinct regions known as bands: - **A Band**: This is the dark band that contains the thick filaments (myosin) and overlaps with the thin filaments (actin). - **I Band**: This is the light band that contains only thin filaments (actin) and is located on either side of the A band. 5. **Conclusion**: Therefore, a sarcomere consists of one A band and one I band, along with the associated thick and thin filaments. ### Final Answer: A sarcomere consists of one A band and one I band. ---
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