| A | B |
|---|
| Axon | neuron structure that carries messages away from the cell body |
| Brain stem | connects the brain to the spinal cord and is made up of the midbrain, the pons, and the medulla |
| Central nervous system | division of the nervous system, made up of the brain and spinal cord |
| Cerebellum | part of the brain that controls voluntary muscle movements, maintains muscle tone, and helps maintain balance |
| Cerebrum | largest part of the brain, where memory is stored, movements are controlled, and impulses from the senses are interpreted |
| Cochlea | fluid-filled structure in the inner ear in which sound vibrations are converted into nerve impulses that are sent to the brain |
| Dendrite | neuron structure that receives messages and sends them to the cell body |
| Homeostasis | regulation of an organism’s internal, life-maintaining conditions |
| Neuron | basic functioning unit of the nervous system, made up of a cell body, dendrites, and axons |
| Olfactory cell | nasal nerve cell that becomes stimulated by molecules in the air and sends impulses to the brain for interpretation of odors |
| Peripheral nervous system | division of the nervous system, made up of all the nerves outside the CNS; connects the brain and spinal cord to other body parts |
| Reflex | simple innate behavior, such as yawning or blinking, that is an automatic response ad does not involve the brain; automatic, involuntary response to a stimulus; controlled by the spinal cord |
| Retina | light-sensitive tissue at the back of the eye; contains rods and cones |
| Synapse | small space across which an impulse moves from an axon to the dendrites or cell body of another neuron |
| Taste bud | major sensory receptor on the tongue; contains taste hairs that send impulses to the brain for interpretation of taste |
