The units of contraction within a muscle fiber are called:
A)sarcolemmas
B)sarcomeres
C)troponin and myosin
D)sarcoplasmic reticulums

Question

Quizplus · Accepted Answer

The units of contraction within a muscle fiber are called sarcomeres. Sarcomeres are made up of actin and myosin filaments and are responsible for the sliding filament theory of muscle contraction. Sarcolemma refers to the cell membrane surrounding the muscle fiber, troponin and myosin are proteins involved in muscle contraction, and sarcoplasmic reticulum is an organelle that stores calcium ions involved in muscle contraction.

The Units of Contraction Within a Muscle Fiber Are Called