| Term | Definition |
|---|---|
| behavior | the things organisms do to surivive and reproduce. |
| brain | part of the central nervous system protected by the skull. |
| central nervous system | where sensory impulses pass through the brain and spinal cord. |
| instinct | an action that is performed without thinking or planning. |
| instinctive | a behavior that is imprinted in an orgnanisms brain from birth and helps it to survive. |
| neuron | a communication cell found in the brain and nervous system. |
| receptor | cells that send messages to the brain when it receives stimuli. |
| response | a reaction of a living thing to a stimulus. |
| response time | the length of time it takes for a person to respond to a stimulus. |
| stimulus | something that causes an action or response. |
