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25 Cards in this Set

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  • Back
What is the major difference between the CNS and the PNS?
The myelin is made of oligodendrocytes instead of Schwann cells
Oligodendrocytes have no ______ or _______ therefor there is no _______ and the sprouts have nothing to guide them back to the _______ so regeneration is ______
ct; basement membrane; tubular remnant; point of attachment; unlikely
does greater stimulation on nerve fivers cause a greater response? what is there response method
no; nerve fibers respond completely or not at all
junction between neurons that contain and secrete neurotransmitters
refractory period-
this is the brief period of time following the passage of a nerve impulse in which the nerve fiver cannot be stimulated
all or none response-
if a nerve fiver responds as all, it responds completely. more stumulation does not cause a greater response
saltatory conduction-
this is thw way impulses are conducted along myelinated merve fibers. this is very repid because the impulse jumps from node of Ranvier to node of Ranvier. (Rather than having to travel the entire length of the membrane as you do on small unmeylinated axons)
neurotransmitters- ex.
chemicals secreted by synaptic vesicles ex. acetylcholine, which stimulates muscle contraction; cholinesterase decomposes the acetylcholine
act as neurotransmitters or neuromodulators; peptides made by the cns that act as neurotransmitters
if an impulse that is below the threshold lefel, the impulse will not be triggered, however, the neuron is more excitable to incoming stimulation bc it is facilitated
this allows an neuron to receive impulses from two or ore incoming fivers. this allows the nervous system to proxess a variety of information
this allows an impulse to leave a neuron on several different fivers. this causes the impulse to be amplified
how are neurons classified?
structure and function
structural differences:
unipolar, bipolar, multipolar
hos one process that branches. one branch acts as a dendrite and the other acts as an axon. found in the pns
has two branches. one axon and one dendrite. found in the eyes ears and nose
has one axon and many dendrites. found in the cns
functional differences:
sensory neurons, motor neuronss, and interneurons
afferent-carry umpulses from the pns to cns
efferent-carry impulses from the cns to the effectors maybe accelerator or inhibitory
connect neurons to the cns
merve fiber is an extention of -
a neuron
what do neurons and neuroglial cells make?
nerve tissue
nerve tissue:
made up of masses of neurons, neurons area the functional units of the nervous system
nerve impulse conduction:
1)unmyelimniated fibers conduct an umpulse along the entire length of membrane 2) this is slow 3)myelinated nerve fibers have specialized structures called the nodes of Ranvier 4)these are extremely permeable to ions 5) this allows impulse to jum from node to node