試題詳解

38. In muscular-skeletal systems, which one is the correct description?
(A) Arthropod exoskeletons are composed primarily of calcium carbonate.
(B) A skeleton that relies on muscular force exerted against water is termed an endoskeleton.
(C) Skeletal muscles are striated, voluntary, and have unbranched fibers.
(D) Each skeletal muscle cell constitutes a single motor unit.
(E) The thick filament is composed almost entirely of actin molecules.