Muscle contains contractile proteins -
- AActin and Myosin
- BActin and Tropomyosin
- CMyosin and Troponin
- DNone of the above
Show answer and explanation
Correct answer: (a) Actin and Myosin
Explanation
The contractile proteins of muscle are actin (thin filaments) and myosin (thick filaments).
When a muscle contracts, the actin filaments slide over the myosin filaments. Tropomyosin and troponin are regulatory proteins that control this.