sensory		a brief electrical charge that travels down the axon
action potential		a simple, automatic, inborn response to a sensory stimulus
neurotransmitter		this nervous system arouses
interneurons		a set of glands that secret hormones into the bloodstream
myelin sheath		basic building block of the nervous system
reflex		neural "cables" containing many axons
somantic		secretes epinephrine and norepinephrine
acetylcholine		a neurotransmitter that enables learning and memory
sympathetic		chemical messangers
nervous system		recieves messages from other cells
adrenal glands		interconnected neural cells
endocrine system		this passes messages away from the cell body
cell body		neurons that carry outgoing information from the CNS to the muscles and glands
threshold		natural, opiatelike neurotransmitters linked to pain control and to pleasure
autonomic		regulates growth
axon		the level of stimulation requred to trigger a neural impulse
neural networks		neurons that carry incoming information from the sense receptors to the CNS
neuron		helps speed neural impulses
motor		this nervous system conserves energy as it calms
dendrites		the body's speedy, electrochemical comunication network
pituitary glands		the cell's life support center
hormones		this nervous system controls the glands and the muscles of our internal organs
nerves		CNS neurons
endorphins		this nervous system enables voluntary control of our skeletal muscles
parasympathetic		chemical messengers