Exam 3 Connect Questions Correctly Answered.
Prior to the arrival of a signal from a presynaptic input, the post-synaptic membrane is polar with a greater relative _________ charge in the ECF.
Positive
In somatic neurons, an action potential arrives at the synapse causing synaptic vesicles to ...
Exam 3 Connect Questions Correctly
Answered.
Prior to the arrival of a signal from a presynaptic input, the post-synaptic membrane is polar with a
greater relative _________ charge in the ECF.
Positive
In somatic neurons, an action potential arrives at the synapse causing synaptic vesicles to fuse with
the ____________ membrane.
Presynaptic
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The presynaptic membrane releases (via exocytosis) acetylcholine (ACh) into the ____________ .
ECF of the synaptic cleft
The ACh diffuses across the cleft and binds to the ____________ channels.
Ligand-regulated sodium
Activated (open) sodium channels allow a rapid diffusion of ____________ down its electrochemical
gradient towards the ICF.
Sodium
The movement of positive charges to the ____________ causes the relative charge across the
membrane to become positive on the inner surface.
ICF
In an adult, the spinal cord ends at which vertebra?
L1
An unmyelinated fiber has voltage gated ion gates along its entire ____________ .
Length
An action potential at the ____________ zone causes sodium to diffuse into the cell. This results in
membrane ____________.
Trigger; Depolarization
The depolarization causes a ____________ that excites the entire membrane. This continues until the
traveling signal reaches the end of the ____________ .
,Repetition; Axon
voltage-gated ion channels
Channels that open or close in response to a change in the membrane potential.
membrane potential
Voltage difference across a membrane
Dendrites
Soma
body
Axon
Nodes of Ranvier
Gaps in the myelin sheath
Axon terminals
Branches at the end of the axon
, axon hillock
Cone shaped region of an axon where it joins the cell body
Internode
Space between nodes
Trigger zone
Junction between the axon hillock and the initial segment
Initial segment
Beginning of the axon; attaches to axon hillock
axon collaterals
Side branches of the axon
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