Muscle cells (myocytes) form the active contractile tissue of the body.
Obliquely striated muscle is intermediate between the other two.
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.
Human anatomy is one of the basic essential sciences of medicine.