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Some of these glands are specialized as mammary glands, producing milk to feed the young.
The filaments are staggered and this is the type of muscle found in earthworms that can extend slowly or make rapid contractions.
The bones of mammals are well ossified and their teeth, which are usually differentiated, are coated in a layer of prismatic enamel.
The teeth are shed once (milk teeth) during the animal's lifetime or not at all, as is the case in cetaceans.
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.
Microscopic anatomy involves the use of optical instruments in the study of the tissues of various structures, known as histology, and also in the study of cells.