The functional unit of contractile system in the striped muscle is sarcomere.

Explanation

### Step-by-Step Solution:

1. **Understanding the Statement**: The statement claims that the functional unit of the contractile system in striped muscle is the sarcomere. We need to determine if this is true or false.

2. **Identifying Striped Muscles**: Striped muscles are also known as skeletal muscles. They are characterized by their striated appearance due to the arrangement of muscle fibers.

3. **Defining the Sarcomere**: The sarcomere is the basic structural and functional unit of striated muscle tissue. It is the segment of the muscle fiber that is responsible for contraction.

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