An individual sarcomere unit consists primarily of
A) a stack of actin fibers.
B) a stack of myosin units.
C) overlapping actin and membrane.
D) overlapping myosin and membrane.
E) overlapping actin and myosin filaments.

Question

Quizplus · Accepted Answer

A sarcomere is the basic unit of a muscle fiber and it consists of overlapping actin and myosin filaments, which slide past each other during muscle contractions. Option A and B are incorrect because a sarcomere does not consist only of actin or myosin fibers alone. Option C and D are incorrect because there is no membrane involved in a sarcomere unit.

An Individual Sarcomere Unit Consists Primarily of