Head MovementsVoluntary or involuntary motion of head that may be relative to or independent of body; includes animals and humans.
MotionPhysical motion, i.e., a change in position of a body or subject as a result of an external force. It is distinguished from MOVEMENT, a process resulting from biological activity.
HeadNo Entry for Head
AnimalsUnicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain Eukarya.
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