For the hierarchy of skeletal muscle organization,which accurately lists the order of structures from "small" to "big"?
A)sarcomere,myofibril,muscle fiber,motor unit
B)myofibril,muscle fiber,sarcomere,motor unit
C)motor unit,myofibril,muscle fiber,sarcomere
D)motor unit,sarcomere,muscle fiber,myofibril
E)None of the choices are correct.

Question

Quizplus · Accepted Answer

The correct order from smallest to largest is sarcomere (the basic contractile unit of muscle fiber), myofibril (a bundle of sarcomeres), muscle fiber (a single muscle cell), and motor unit (a motor neuron and the muscle fibers it controls).

For the Hierarchy of Skeletal Muscle Organization,which Accurately Lists the Order