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Human Body System #3

Unit 2 Test Study Stack

QuestionAnswer
A momentary reversal in electrical potential across a plasma membrane (as of a nerve cell or muscle fiber) that occurs when a cell has been activated by a stimulus. Action Potential
A long nerve cell process that usually conducts impulses away from the cell body. Axon
Any of the usually branching protoplasmic processes that conduct impulses toward the body of a neuron. Dendrite
An atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. Ion
In a neuron, an insulating coat of cell membrane from Schwann cells that is interrupted by nodes of Ranvier. Myelin Sheath
A physician skilled in the diagnosis and treatment of disease of the nervous system. Neurologist
A nerve cell; the fundamental unit of the nervous system, having structure and properties that allow it to conduct signals by taking advantage of the electrical charge across its cell membrane. Neuron
A substance (as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse. Neurotransmitter
The time elapsing between the beginning of the application of a stimulus and the beginning of an organism's reaction to it. Reaction Time
An automatic to a stimulus that involves a nerve impulse passing inward from a receptor to the spinal cord and thence outward to an effector (as a muscle or gland) without reaching the level of consciousness and often without passing to the brain. Reflex
The place at which a nervous impulse passes from one neuron to another. Synapse
Created by: maseyann
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