| A | B |
|---|
| regulation | is the control and coordination of all life activities |
| receptors | are specialized structuresthat are sensitive to changes in the internal and external enviorment |
| neurons | nevrve cells |
| effectors | muscle or galnd in which neurons are attached to |
| impulse | elctrochemical message |
| stimulus | is a change in the internal or external enviornment which innitiates an impulse ex: hot stove |
| receptors | structures that are specialized to detect stimuli |
| dendrites | fibers that detect stimuli and generate an impulse toward the cyton |
| cyton | know as the cell body contains the neucleus of a neuron |
| axon | a fiber taht translates an impulse away from the cyton |
| terminal branches | the end of axons that secrete neurotransmitters |
| synapse | l The gap between the terminal branches of 1 neuron and the dendrites of another neuron. |
| Neurotransmitters | l Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse |
| Receptor | receives the stimulus and initiates an impulse |
| . Sensory neuron | carry impulses from the receptors toward the spinal cord and brain |
| . Interneuron | relay impulses from one neuron to another |
| Motor neuron | carry impulses from brain and spinal cord toward the effectors |
| . Effector | is a muscle or gland |
| Hydra | l Contains no brain or control center, so impulses travel in all directions across a nerve net |
