ATPase enzyme required for muscle contraction is located in :

Options

A. Actinin
B. Troponin
C. Myosin
D. Actin

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Contraction**: Muscle contraction is a complex process that involves the interaction of various proteins and enzymes. The primary proteins involved in muscle contraction are actin and myosin.

2. **Role of ATP**: ATP (adenosine triphosphate) is the energy currency of the cell. During muscle contraction, ATP is required for the myosin heads to attach to actin filaments and perform the power stroke that leads to contraction.

3. **Location of ATPase**: The enzyme ATPase is responsible for hydrolyzing ATP to release energy. In muscle cells, this enzyme is specifically located in the myosin protein, which forms the thick filaments of the muscle fibers.

4. **Function of Myosin**: Myosin interacts with actin to facilitate muscle contraction. When ATP is hydrolyzed by myosin ATPase, it provides the energy needed for the myosin heads to pull on the actin filaments, leading to muscle shortening and contraction.

5. **Conclusion**: Therefore, the ATPase enzyme required for muscle contraction is located in myosin.

**Final Answer**: Myosin

---