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'Morphine within', natural, opiatelike neurotransmitters linked to pain control and pleasure

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Neural cables containing many axons. These bundled axons, which are part of the peripheral nervous system, connect the central nervous system with muscles, glands, and sense organs.

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The sensory and motor neurons that connect the CNS to the rest of the body.

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A neurotransmitter that enables learning and memory and also triggers muscle contraction.

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The brain and spinal cord.

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The body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous systems.

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Chemical messengers that traverse the synaptic gaps between neurons. When released by the sending neuron, neurotransmitters travel across the synapse and bind to receptor sites on the receiving neuron, thereby influencing whether that neuron will generate a neural impulse.

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The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. The tiny gap at this junction is called the synaptic gap or cleft.

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The level of stimulation required to trigger a neural impulse

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A neural impulse; a brief electrical charge that travels down an axon. The action potential is generated by the movement of positively charged atoms in and out of an axon's membrane.

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The extension of a neuron that receive messages and conduct impulses toward the cell body.

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A layer of fatty tissue segmentally encasing the fibers of many neurons; encasing vastly greater transmission speed of neural impulses as the impulse hops from one node to the next.

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The bushy, branching extensions of a neuron that receive messages and conduct impulses toward the cell body.

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A nerve cell; the basic building block of the nervous system.

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A branch of psychology concerned with the links between biology and behavior.