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tissue that receives messages from the body's external and internal environment, analyzes the data, and directs the response
tissue that controls the internal movement of materials in the body, as well as external movement
extension of the cell body of a neuron that carries impulses from the environment or from other neurons toward the cell body
reversal of charges across the cell membrane of a neuron; also called a nerve impulse
fluid in the space between the meninges that acts as a shock absorber that protects the central nervous system
structure that connects the brain and spinal cord; includes the medulla oblongata and the pons
brain structure that receives messages from the sense organs and relays the information to the proper region of the cerebrum for further processing
brain structure that acts as a control center for recognition and analysis of hunger, thirst, fatigue, anger, and body temperature
sensory receptor, sensory neuron, motor neuron, and effector that are involved in a quick response to a stimulus
neuron that reacts to a specific stimulus, such as light or sound, by sending impulses to other neurons and eventually to the central nervous system
transparent object behind the iris that changes shape to help adjust the eye's focus to see near or distant objects
in gymnosperms, a seed-bearing structure; in the retina of the eye, a photoreceptor that responds to light of different colors, producing color vision
fluid-filled part of the inner ear; sends nerve impulses to the brain through the cochlear nerve
one of three structures within the inner ear that help monitor the position of the body
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