Individual contractile units in muscle fibers are called:
A) Z disks.
B) sarcomeres.
C) myofibrils.
D) myomeres.
E) porphyrins.

Question

Quizplus · Accepted Answer

The individual contractile units in muscle fibers are called sarcomeres. This is where the actin and myosin filaments interact to cause muscle contraction. Z disks are the borders of each sarcomere, myofibrils are bundles of sarcomeres, myomeres are segments of skeletal muscles in vertebrates, and porphyrins are organic compounds involved in heme synthesis.

Individual Contractile Units in Muscle Fibers Are Called