ATPase of the type muscle is located in

Options

A. actinin
B. troponin
C. myosin
D. actin

Explanation

**Step-by-Step Solution:**

1. **Understanding Muscle Structure**: The question pertains to the location of ATPase in muscle tissue. First, we need to understand that skeletal muscles, also known as striated muscles, are responsible for voluntary movements and are characterized by a striped appearance due to the arrangement of contractile proteins.

2. **Identifying Contractile Proteins**: The two main contractile proteins in skeletal muscles are actin (thin filaments) and myosin (thick filaments). These proteins are crucial for muscle contraction.

3. **Role of ATP in Muscle Contraction**: Muscle contraction requires energy, which is provided by ATP. The ATPase enzyme is responsible for hydrolyzing ATP to release energy necessary for muscle contraction.

4. **Locating ATPase**: The ATPase activity is associated with the myosin protein. Specifically, it is found in the globular head of the myosin, which is part of the thick filament. This globular head not only binds to actin but also has ATPase activity, allowing it to catalyze the breakdown of ATP.

5. **Conclusion**: Therefore, the ATPase of the muscle is located in the myosin protein, specifically in the globular head of the heavy meromyosin portion of the thick filament.

**Final Answer**: The ATPase of the muscle is located in the myosin protein (thick filament).

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