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10 Cards in this Set

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  • Back
What are the two main sections of the nervous system?
The Central Nervous System(CNS), and the Peripheral Nervous System(PNS).
What is the function of the axon?
The axon carries impulse to other neurons or to the effectors; the directioni of travel is away from the cell body.
What is the All or None Theory?
The neuron either responds to stimuli (threshold was reached), or not at all.
What is action potential and when does occur?
Action potential is the rapid reversal of charge across the axon membrane. The membrane is being depolarized, when an impulse travels through.
What is the synapse?
The space between a neuron's axon on its target for transmission. Also called the synaptic cleft.
What is the difference between pre- and postsynaptic neurons?
Presynaptic neurons are before the cleft, and postsynaptic occur after the cleft.
What is saltatory conduction?
The impulse or travel down a myelinated axon.
What is the difference between sensory, inter-, and motor neurons? Define all three.
a)Sensory neurons begin with a sense organ or receptor, and carry impulses to the CNS.
b)Interneurons connect other neurons together(eg. sensory and motor). They are found in the CNS.
c)Motor neurons recieve impulses from the CNS and carry them to the effectors like muscles, tissues, or glands.
What are the Nodes of Ranvier?
The Nodes of Ranvier are gaps between Schwann cells in the Myelin sheath that speed up transmission.
What three steps must all neural pathways include?
1. Reception
2. Transmission
3. Processing