Question

State whether the following statements are true or false.
H-zone of striated muscle fibre represents both thick and thin filaments.

• A. True
• B. False

Answer 1

The correct option is B False

• Myofibril activity is required for muscle contraction on the molecular level.
  
• When ATP binds to myosin, it separates from the actin of the myofibril, which causes a contraction.
• Creatine phosphokinase helps in the regeneration of ATP.
• H zone with no actin disappears and Z zone moves towards each other.
• The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin.
• ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

So, the correct option is 'False'.