Neurotransmission
with 100% fully solved
questions(graded A+)
Neuron - answer a cell that is specialized to conduct nerve impulses
Dendrites - answer branching extensions of neuron that receives
messages from neighboring neurons
Cell body - answer largest part of a typical neuron; contains the nucleus,
the dendrites, and much of the cytoplasm
Nucleus - answer a part of the cell containing DNA and RNA and
responsible for growth and reproduction
Cytoplasm - answer the protoplasm of a cell excluding the nucleus, a
jellylike fluid inside the cell in which the organelles are suspended
Axon hillock - answer The conical region of a neuron's axon where it joins
the cell body; typically the region where nerve signals is generated.
Axon - answer the extension of a neuron, ending in branching terminal
fibers, through which messages pass to other neurons or to muscles or
glands
Myelin sheath - answer a layer of myelin encasing (and insulating) the
axons of medullated nerve fibers
, Nodes of Ranvier - answer small gaps in the myelin sheath of medullated
axons, small gaps of exposed axon, between the segments of myelin
sheath, where action potentials are transmitted
Terminal branch - answer Output portion of the nerve cell
Axon terminal - answer terminal button, synaptic knob; the structure at
the end of an excellent terminal branch; houses the synaptic vesicles and
neurotransmitters
Synapse - answer The interface between neurons, containing the
terminal branch, the synaptic cleft, and the dendrites of the next neuron.
Synaptic cleft - answer space between two connecting neurons where
neurotransmitters are released
Neurotransmitters - answer Small chemical messengers that traverse the
synaptic gaps between neurons. Neurotransmitters act as keys in opening
specific receptors that perform specific actions.
Vesicle - answer A membrane- bound sack inside the axon terminal that
holds the neurotransmitters
Perspectives - answer One neuron can receive neurotransmitters from
thousands of different neurons
Any neuron can send neurotransmitters to thousands of different neurons
Each receptor on dendrite will take only the neurotransmitter which has
the precise shape and polarity to fit (so there are many types of receptors
on each dendrite).