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Basic Structure and Function Nervous Tissue Function Action Potential Communication Between Neurons
100
neurons and glial cells
What are two basic types of cells in CNS and PNS?
100
from dendrites, across the cell body and down the axon
What direction does an action potential move along a neuron?
100
graded potential
What is a change in the membrane potential that varies in size, depending on the size of the stimulus that elicits it?
100
a ligand (neurotransmitter)
What binds to extracellular region of ligand-gated channel?
100
depolarizing and hyperpolarizing
What are the two kinds of graded potentials?
200
dendrites
What part of neuron receives most of the input from other neurons?
200
insulation and myelination
What functions do oligodendrocytes and Schwann cells have in common?
200
threshold
What is the membrane voltage at which an action potential is initiated?
200
large negative proteins, chloride ions and nucleic acids inside cell
What keeps a cell membrane negatively polarized?
200
unipolar cell
What type of neuron does a generator potential occur in?
300
ganglion
What is a cluster of neurons in PNS called?
300
immune surveillance and phagocytosis
What is the function of a microglia in CNS?
300
action potential
What is a change in voltage of a cell membrane in response to a stimulus that results in transmission of an electrical signal (unique to neurons and muscle fibers)?
300
becomes depolarized (membrane potential moves toward zero)
What happens to cell membrane potential as Na+ moves through it?
300
temporal summation
What kind of summation is a combination of graded potentials at same location from one input?
400
gray matter
What region in brain contains cell bodies, dendrites and unmyelinated axons?
400
line each ventricle in heart
Where can ependymal cells be found?
400
a lower motor neuron
What does an upper motor neuron contracts?
400
absolute refractory period and relative refractory period
What are the two phases of the refractory period?
400
metabolic changes
What kind of changes does a metabotropic receptor cause in a cell?
500
somatic nervous system (SNS)
What functional division of brain is responsible for conscious perception and voluntary motor responses?
500
myelin sheath
What facilitates transmission of electrical signals along the axon?
500
causes contraction of a targeted skeletal muscle
What is the function of a lower motor neuron?
500
a myelinated axon
What kind of axon does a saltatory conduction travel along?
500
presynaptic element, neurotransmitter, synaptic cleft, receptor proteins, postsynaptic element and neurotransmitter elimination or re-uptake
What do all synapses have in common?






Nervous System

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