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Anatomy and physiology Biol 203 Exam Questions And Answers
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Anatomy and physiology Biol 203 ExamQuestions And Answers
Drag each image on the left into the figure to correctly show the sequence of events at
an excitatory adrenergic synapse. Step 2 has already been completed for you
1 --> 3 --> 2
Long-term memory may be based on molecular alterations due to a process called
long-term potentiation. This is based upon the interaction of glutamate with NMDA
receptors. Ca2+ enters the dendrite and, as a result, the neuron does which of the
following? check all that apply.
a. it makes even more NMDA receptors, so that in the future it will be more sensitive to
glutamate
b. it synthesizes carbohydrates involved in physically restructuring a synapse.
c. it releases epinephrine which diffuses back to the presynaptic neuron and triggers
still glutamate release.
d. it synthesizes proteins concerned with physically remodeling a synapse.
e. if releases nitric oxide, which diffuses back to the postsynaptic neuron and triggers
still more glutamate release.
a, d, e
drag each image below into the figure so that it correctly represents the sequence of
events with respect to the transmission at a cholinergic synapse. Step 3 has already
been done for you.
. check the homework
Neurotransmitter release from the presynaptic membrane stops and existing ACh in the
cleft is degraded by ____________________
acetylcholinesterase.
with a ___________________________, the ligand-regulated channels begin closing as they
release their bound ACh.
decreasing cleft concentration of ACh
, We have an expert-written solution to this problem!
Without the continued sodium influx into the cell through the ligand-gated channels, the
constant _______________________ causes the membrane potential to return back to RMP.
leak of potassium to the ECF
We have an expert-written solution to this problem!
RMP is re-established, and the _________________ maintain the ion concentration across
the membrane, having sodium more concentrated in the ECF and potassium more
concentrated in the ICF.
ATPase pumps
We have an expert-written solution to this one! Which of the following does encoding of
stimulus strength depend on? check all that apply
a. various neurons share the same threshold of excitation
b. the stronger a neuron is stimulated the less frequently it fires.
c. different neurons possess different thresholds of excitation.
d. the stronger a neuron is stimulated the more frequently it fires.
c, d
put the labels in the appropriate place to identify where in the structure or event occurs
identify the following diagrams as to the type of neural circuit they are
yellow - diverging
gray - converging
blue - parallel after-discharge
green - reverberating
which of the following do terminate a postsynaptic transmission? choose all that apply.
a. Neurotransmitter diffuses into the nearby extra-cellular fluid
b. monoamine oxidase is inhibited
c. reuptake of the neurotransmitter by endocytosis
d. breakdown of the neurotransmitter in the synaptic cleft
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