Which best describes the primary function of muscle tissue?

• A. Contract to produce active movement
• B. Transmit nerve impulses
• C. Store minerals
• D. Protect neurons

Answer: (A)

Muscle tissue’s main job is to contract to create movement. When muscle fibers contract, they shorten by the sliding of actin and myosin filaments, using energy from ATP and regulated by calcium. This pulling action generates force that moves bones or contents of organs, enables posture, and even generates heat with widespread muscle activity. The other statements describe roles of other tissues: transmitting nerve impulses is a function of nervous tissue, storing minerals is mainly a role of bone, and protecting neurons relates to the nervous system and supporting structures, not muscle. So the primary function of muscle tissue is to contract to produce active movement.