Answer: ATP.
- A ATP
- B DNA
- C glucose alone
- D RNA
Correct answer: A. ATP
Explanation: ATP provides the energy for the actin–myosin cross-bridge cycle.
A sarcomere (Z line to Z line): during contraction the I band and H zone shorten as thin filaments slide over thick, while the A band stays the same length. Image: SlothMcCarty, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.