| A | B |
|---|
| Stimulus | something that causes a response in an organism or a part of the body. |
| Autonomic Nervous System | the part of the nervous system that controls involuntary actions and responses. |
| Voluntary Nervous System | the part of the nervous system that consciously controls function and movement. |
| Axon | the branch of a neuron that carries impulses away from the body of the nerve cell. |
| Brain stem | connects the brain to the spinal cord; made up of the midbrain |
| Central Nervous System | the part of the nervous system made up of the brain and spinal cord. |
| Cerebellum | the part of the brain that interprets stimuli from the eyes |
| Cerebrum | the largest part of the brain |
| Dendrite | the branch of the neuron that receives impulses from other neurons and sends them to the body of the nerve cell. |
| Homeostasis | the regulation of conditions inside an organism to maintain life |
| Neuron | the basic unit of the nervous system--- a nerve cell. |
| Peripheral Nervous System | the part of the nervous system made up of all the nerves outside the central nervous system. |
| Reflex | an involuntary automatic response to a stimulus. |
| Synapse | small space between neurons through which an impulse crosses. |
| Somatic System | part of the nervous system that controls voluntary actions and is made up of the cranial and spinal nerves that go from your central nervous system to your skeletal muscles. |
| Cochlea | fluid-filled structure shaped like a snail’s shell which is located in the inner ear. |
| Olfactory cells | nerve cells in the nasal passages. |
| Retina | the tissue at the back of the eye that is sensitive to light energy. |
| Taste bud | major sensory receptor for taste. |
| Convex lens | a lens that is thicker in the middle and thinner on the edges and is used to correct farsightedness. |
| Concave lens | A lens thicker at the edges than in the middle and is used to correct nearsightedness. |
| Nearsightedness | a condition in which a person cannot see distant objects clearly. |
| Farsightedness | a condition in which a person cannot see close objects clearly. |
| Cones | cells in the eye that responds to bright light and color. |
| Rods | cells in the eye that responds to dim light and helps distinguish shapes and movement. |
