BIOL 3240 Exam 2 | Complete Solutions (Verified) The process whereby a neuron communicates with another cell, which can be another neuron or a muscle cell Synaptic transmission Who was the first person to coin the term "synapse?" Charles Sherrington The region between pre and post synaptic cells ...
The process whereby a neuron communicates with another cell, which can be another
neuron or a muscle cell
Synaptic transmission
Who was the first person to coin the term "synapse?"
Charles Sherrington
The region between pre and post synaptic cells
zone of apposition\
(chemical/electrical) synapses are used to generate rapid and stereotyped depolarizing
signals
Electrical
(chemical/electrical) synapses are capable of variable signaling, mediating either
excitatory or inhibitory signals
Chemical
Chemical synapses can mediate excitatory or inhibitory signals and changes in ____
properties to the postsynaptic cell
Electrical
What protein helps stabilize synapses and the pre/post synaptic cells at this junction?
Connexin
In an electrical synapse, what is the distance between pre and postsynaptic cell
membranes?
4 nm
(chemical/electrical) synapses have cytoplasmic continuity between the pre and
postsynaptic cells
Electrical
What is the distance between pre and post synaptic cell membranes in a chemical
synapse?
20 to 40 nm
What is the agent of transmission in an electrical synapse?
Ion current
The structural cellular component responsible for passing the agent of transmission in
an electrical synapse
, Gap junction
The structural cellular component responsible for passing the agent of transmission in
a chemical synapse
vesicles, active zones, postsynaptic receptors
Which type of synapse has a more significant synaptic delay, chemical or electrical?
Chemical
How long is the synaptic delay of a chemical synapse?
1-5 ms
The direction of transmission of an electrical synapse
Bidirectional
The direction of transmission of a chemical synapse
Unidirectional
At an electrical synapse, when an outward current in the presynaptic cell is strong
enough, some of the current can enter the postsynaptic cell through...
gap junctions
In an electrical synapse, the presynaptic neuron has to generate a large enough current
to do what?
depolarize both presynaptic and postsynaptic cells
In an electrical synapse, why is the postsynaptic cell typically smaller than the
presynaptic cell?
to be depolarized by the current that also depolarizes the presynaptic cell
A gap junction channel consists of a pair of ____ _____, creating a pore between the
neurons
hemi channels
[Gap junction structure] Each hemi channel consists of what type of protein subunit?
How many?
6, connexin
Electrically coupled cells generally have (higher/lower) thresholds
Higher
Electrical synapses have very short to almost no synaptic delay. What are the firing
patterns of electrically coupled cells?
they fire synchronously
A presynaptic cell at a chemical synapse can contain between ___ to ____ vesicles
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