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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 ...

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  • November 6, 2024
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  • 2024/2025
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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

Brainpower

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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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