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Muscle is formed of contractile filaments and is separated into three main types; smooth muscle, skeletal muscle and cardiac muscle.
Smooth muscle has no striations when examined microscopically.
It contracts slowly but maintains contractibility over a wide range of stretch lengths.
The filaments are staggered and this is the type of muscle found in earthworms that can extend slowly or make rapid contractions.Their bodies tend to be dorso-ventrally flattened, they usually have five pairs of gill slits and a large mouth set on the underside of the head.The dermis is covered with separate dermal placoid scales.Skeletal muscle contracts rapidly but has a limited range of extension.It is found in the movement of appendages and jaws.
Anatomy is the branch of biology concerned with the study of the structure of organisms and their parts.