Subunits of skeletal muscle cells that are composed of sarcomeres are called
A)myofibrils.
B)myofilaments.
C)sarcolemmas.
D)transverse tubules.

Question

Quizplus · Accepted Answer

Sarcomeres are the functional units of skeletal muscle, which are composed of myofibrils. Each myofibril is made up of repeating units of sarcomeres.

Answer: B
 Sarcomeres contain two types of protein filaments, called myofilaments, which are responsible for muscle contraction. The thin filaments are primarily composed of actin, while the thick filaments contain myosin.

Choices C and D are not correct as they refer to other structures within the muscle cell, but do not specifically relate to the subunits composed of sarcomeres.

Subunits of Skeletal Muscle Cells That Are Composed of Sarcomeres