Biol 161 Exam 3 Psu Questions And
Answers With Verified Solutions Already
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Synapse - ANSWER✔✔ A junction where information is transmitted from one
neuron to the next
Neurotransmitters - ANSWER✔✔ chemical messengers that cross the synaptic
gaps between neurons
presynaptic cell - ANSWER✔✔ sending neuron
postsynaptic cell - ANSWER✔✔ receiving neuron
voltage-gated calcium channels - ANSWER✔✔ open to allow calcium into axon
terminal which in turn releases neurotransmitters into synaptic cleft
Ligand gated ion channels - ANSWER✔✔ transmembrane ion channel that
open/close as a response to binding of ligand
voltage-gated ion channels - ANSWER✔✔ Channels that open or close in
response to a change in the membrane potential
chemical gated ion channels - ANSWER✔✔ channels that open only if a
neurotransmitter first attaches to a receptor
mechanical gated ion channels - ANSWER✔✔ channels that open in response to
deformation (touch, pressure, or vibration) of the membrane surface
afferent neurons - ANSWER✔✔ Nerve cells that carry impulses towards the
central nervous system. somatic, visceral, and special
efferent neurons - ANSWER✔✔ Nerve cells that conduct impulses away from the
central nervous system. somatic, visceral
CNS (central nervous system) - ANSWER✔✔ brain and spinal cord
Hyperpolarization - ANSWER✔✔ an increase in the membrane potential of a cell,
relative to the normal resting potential
Depolarization - ANSWER✔✔ a decrease in membrane potential of a cell
Summation - ANSWER✔✔ the sum of all local potential changes at a synapse of a
postsynaptic cell
frequency of action potentials - ANSWER✔✔ the reciprocal of the interspike
interval, and measured in Herz
Binding of neurotransmitters to channels will immediately cause a(n)
_________________ to occur in the postsynaptic neuron. - ANSWER✔✔ local
potential
What type of ion is directly required for fusion of a vesicle to the cell membrane,
resulting in the "release" the neurotransmitters into the synapse? - ANSWER✔✔
calcium
Neurotransmitters will bind to which of the following type of protein channels in
the postsynaptic cell membrane? - ANSWER✔✔ chemical gated ion channel
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