Resting muscle length means?: (A) Length of actin and myosin before contraction, (B) The length of the muscle fiber at the onset of contraction which is required to attain maximum active tension, (C) It is about 4 micrometers, (D) Length at which muscle has minimal tension
Answer is B. Resting length: The length of the muscle fiber at the onset of contraction which is required to attain maximum active tension It is about 2 micrometers. Also known as optimum length. At this state, the ends of actin filaments extending from 2 successive Z disks barely overlap one another.