Muscles

Sliding Filament Model

An explanation for muscle contraction based on the movement (sliding) of actin filaments in relation to myosin filaments.

Smooth Muscle

Nonstriated, involuntary muscle tissue found in the walls of the internal organs.

Myofibrils

One of hundreds of thousands of cylindrical subunits that make up a skeletal muscle cell (fibre)

Myofilaments

One of many microscopic, string-like structures, composed of actin and myosin, that make up myofibrils; responsible for muscle contractions.

Actin Myofilament

Protein that, along with myosin is the chief component of muscle; makes up the thin filament of a muscle fibre; also a main component of the cellular cytosketeton.

Muscle Fibres

Skeletal Muscle Cell.

Myosin Myofilament

Thick myofilament consisting of two strands of mysosin molecules wound around each other; one end consists of a long rod, while the other end consists of a double-headed globular region; works with actin myofilament to produce muscle contractions.

Cardiac Muscle

Striated, involuntary muscle found only in the heart.

Skeletal Muscle

Striated, voluntary muscle tissue that comprises skeletal muscles; also called striated.