Skeletal Muscles

The A band is the region of a sarcomere that contains only thick filaments (myosin).

Tendons attach skeletal muscles to bones.

Skeletal muscle is also called voluntary muscle.

The thick filaments in a muscle cell are called myosin.

The M line is the middle of the sarcomere where thick filaments are anchored.

The I band is the region of a sarcomere that contains only thin filaments (actin).

The Z line is the boundary between adjacent sarcomeres and anchors the thin filaments.

Smooth muscle is involuntary and not striated.

Actin is a thin filament that interacts with myosin to facilitate muscle contraction.

The primary function of skeletal muscles is to facilitate voluntary movement of the body.