| A | B |
|---|
| neuron | basic functioning unit of the nervous system |
| dendrite | neuron structure that receives messages and sends them to the cell body |
| axon | neuron structure that carries messages away from the cell body |
| synapse | small space across which an impulse moves from an axon to dendrites or cell body of another neuron |
| sensory receptors | produce electrical impulses and respond to stimuli, such as changes in temperature, sound pressure and taste |
| motor neurons | conduct impulses from the brain throughout the body |
| interneurons | relay impulses to motor neurons |
| brain stem | connects the brain to the spinal cord |
| motor neurons | neurons that move impulses from the brain |
| neuron | nerve cell |
| cerebellum | brain part that maintains muscle tone |
| retina | eye tissue made up of rods and cones |
| cochlea | fluid filled structure in inner ear |
| taste buds | major sensory receptors for taste |
| ofactory cells | cells that aid in the sense of smell |
| reflex | involuntary automatic response to a stimulus |
| sensory | neurons that move impulses to the brain |
| synapse | the space between one neuron and the next |
| homeostasis | the regulation of steady , life maintaining conditions inside |
| peripheral nervous system | system made up of the brain and the spinal cord |
| depressants | slows down the activites of the central nervous system;impairs concentration, resoning, judgement, affects muscle control and memory |
| stimulants | speeds up activity, increases heartbeat, urine production, creates restlessness, tremors, can't sleep |
| steps when light enters the eye | 1.light passes thru the cornea.2.light passes thru the lens.3)The lens directs rays onto the retina.4)Impulses from rods and cones pass it to the optic nerve.5)optic nerve carries the impulses to the visual area of the cortex |
| the ear | made up of outer ear, inner ear and middle ear |
| 5 basic taste sensations | sweet, salty, bitter, sour,MSG |
| cerebrum | largest part of the brain where thinking takes place |
| cerebellum | coordinates muscle movement and maintains balance |
| brain stem | at the base of the brain; the medulla controls vital functions such as heartbeat, breathing and blood pressure |
| spinal cord | an extension of the brain stem made up of bundles of neurons |
