Multiple choice

Which of the following proteins is present in the muscles?

  1. Casein

  2. Myosin

  3. Renin

  4. Keratin

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Myosin and actin are filamentous protein molecules contained in muscles. In the presence of calcium ions  myosin and actin  slide past each other and form cross-bridges, thereby contracting the muscle.