The functional unit of a muscle cell is the sarcomere , which is responsible for muscle contraction. It is composed of proteins such as actin and myosin that interact to produce movement. The endomysium provides support but is not considered a functional unit. ;
The functional unit of a muscle cell is the sarcomere , responsible for muscle contraction. It consists of actin and myosin proteins that interact to create movement. The endomysium is supportive tissue, not a functional unit.
;