Glossary and Related Words Definitions of the Words You May Not Know and Words You Should Know (That Are About This Topic)
vertebrates - noun "an animal that has a backbone and a skeleton" (humans are technically animals, so we are vertebrates)
invertebrate - noun "an animal lacking a backbone" nervous tissue - noun "the main component of the two parts of the nervous system"
skull - noun "the structure of bones that form the head and face of a person or animal"
voluntary - adjective "done or given because you want to and not because you are forced to; done or given by choice"
involuntary - adjective "not done by choice" nervous system - noun "it controls everything you do, including breathing, walking, thinking, and feeling"
spinal cord - noun "the large group of nerves which runs through the center of the spine and carries messages between the brain and the rest of the body"
brainstem - noun "theportion of thebrain,consisting of themedullaoblongata,ponsVarolii,andmidbrain,thatconnectsthespinalcord to the forebrainandcerebrum"