Always
Hope
For
The
Best
100
Action Potential travel what direction and this is maintained by?
What is -APs travel uni-directionally from the axonal hillock to the axon terminal -This is maintained by the absolute refractory period which closes channels as soon as the AP passes by
100
Astrocytes
What is -Aid in repairing damaged tissue -Provide mechanical support -Provide nutrients to the nervous tissue
100
Internodes
What is the myelinated region
100
Mammalian nerves can conduct ______ APs per second
What is 500-1000 APs per second
100
Synaptic Transmission
What is transfer of electrical signal from presynaptic cell to postsynaptic cell
200
Glial Cells
What is -More abundant then neurons -Do not generate or conduct APs -Do not form a synapses with neurons
200
Oligodendrocytes
What is insulate (myelinate) axons in the CNS
200
Saltatory Conduction
What is -AP "leaps" between myelin sheathes -Rapid Conduction -APs "leap" from one Node of Ranvier to the next
200
Synapse
What is signal transmission from neuron to another cell
200
Electrical Synapse
What is Gap Junction
300
Ependymal Cells
What is line the ventricles and produce CSF
300
Schwann cells
What is myelinate axons in the PNS
300
Two ways to increase AP speed
What is myelination; increasing diameter of axon
300
Synpatic Cleft
What is space between the presynaptic cleft and postsynaptic cell
300
Chemical Synapse
What is chemical messengers crosses synaptic cleft
400
Microglia
What is resident macrophages of the CNS
400
Myelin
What is -Insulatiing layer of lipid-rich Schwann cells wrapped around axon -Reduce "leakage" of charge across membrane
400
Disadvantage of large axons
What is -Take up a lot of space >Limits number of neurons that can be packed into the nervous system -Large volume of cytoplasm makes them more expensive to produce and maintain
400
Postsynaptic Cleft
What is a neuron, muscle cell, or endocrine cell
400
Mauthner Neurons
What is long nerves with electrical synapses responsible for the startle effect
500
Microglia Functions
What is respond quickly to foreign material and damaged nervous tissue
500
Nodes of Ranvier
What is areas of exposed axonal membrane between Schwann Cells
500
Maximum frequency is limited by
What is the absolute refractory period
500
Neuromuscular Junction
What is synapse between a motor neuron and a skeletal muscle cell
500
Chemoreceptors
What is chemical receptors
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