What is the smallest contractile unit of a muscle cell?

Question

Quizplus · Accepted Answer

The smallest contractile unit of a muscle cell is the sarcomere. It is the functional unit of a muscle fiber, responsible for generating the force needed for muscle contraction. Sarcomeres are composed of proteins, including myosin and actin, which interact to produce muscle contraction. Myofibrils are the long, cylindrical structures that contain many sarcomeres and are responsible for the striated appearance of skeletal and cardiac muscle. Sarcolemma is the plasma membrane of a muscle cell. Myosin is one of the contractile proteins found in sarcomeres, but it is not the smallest contractile unit of a muscle cell.

What Is the Smallest Contractile Unit of a Muscle Cell