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| A stimulus whose strength is too low to initiate a response. |
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| Change in the cell's membrane potential where the interior becomes less negative. |
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The restoration of a polarized state across a membrane, as in a muscle fiber following contraction. |
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| A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse. |
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| Carrying inward to a central organ or section, as nerves that conduct impulses from the periphery of the body to the brain or spinal cord. |
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| Directed away from a central organ or section. |
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| The usually long process of a nerve fiber that generally conducts impulses away from the body of the nerve cell. |
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| A branched protoplasmic extension of a nerve cell that conducts impulses from adjacent cells inward toward the cell body. A single nerve may possess many dendrites. Also called dendron. |
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| A nerve cell found entirely within the central nervous system that acts as a link between sensory neurons and motor neurons. |
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PNS
(Peripheral nervous system) |
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Definition
| Portion of the nervous system consisting of nerves and ganglia that lie outside of the brain and spinal cord. |
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CNS
(Central nervous system) |
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| What information from one neuron to another neuron flows over. |
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| The tiny space between two nerve cells across which the neurotransmitter acetylcholine diffuses. |
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| A protein in cell membranes that uses the energy of ATP to pump 3 sodium ions out of the cytoplasm while moving 2 potassium ions into the cytoplasm. |
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| An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellect. |
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The thick, whitish cord of nerve tissue that extends from the medulla oblongata down through the spinal column and from which the spinal nerves branch off to various parts of the body. |
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| The potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse. |
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| The neural path of a reflex. |
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| Nerves that contain process of sensory neurons and carry impulses to the CNS. |
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| Nerves that carry impulses leaving the brain and spinal cord, and destined for effectors. |
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| A neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter |
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Definition
| A neuron to the cell body or dendrite of which an electrical impulse is transmitted across a synaptic cleft by the release of a chemical neurotransmitter from the axon terminal of a presynaptic neuron. |
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Definition
| Accumulation of effects, especially those of muscular, sensory, or mental stimuli. |
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