ATPase enzyme needed for muscle contraction is located in
" " Or
The contractile protein of skeletal muscle involving ATPase activity is

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Structure**: Muscles are made up of muscle fibers, which contain two main types of contractile proteins: actin and myosin.

2. **Identifying the ATPase Activity**: The question asks for the contractile protein that has ATPase activity, which means it can hydrolyze ATP to release energy necessary for muscle contraction.

3. **Analyzing the Proteins**:
- **Actin**: This protein provides binding sites for myosin but does not have ATPase activity.
- **Myosin**: This protein is known to possess ATPase activity, allowing it to hydrolyze ATP into ADP and inorganic phosphate, which releases energy.

4. **Conclusion**: Since myosin is the protein that has the ATPase activity necessary for muscle contraction, the answer to the question is:
- **ATPase enzyme needed for muscle contraction is located in myosin.**
- **The contractile protein of skeletal muscle involving ATPase activity is myosin.**