1

Behavior
What a plant or animal does
2

Brain
The organ that serves as the primary control center of the nervous system in all vertebrate and most invertebrate animals
3

Chemical Input
A chemical that enters the body
4

Electromagnetic Input
Signals that enter the body in the form of electromagnetic stimuli
5

Mechanical Input
Signals that enter the body through physical touch or vibration
6

Nerve Cell
A cell specialized for transmitting fast electrochemical signals
7

Sensory Receptor
A nerve ending that sends signals to the central nervous system when it is stimulated
8

Stimulus
An action or condition that provokes a response