Portage Biod 152 module CORRECT
SOLUTIONS GRADE A+
this is a collection of cell bodies found in the peripheral nervous
system
ganglia
This part of the autonomic system accelerates the heart beat and
increases breathing rate.
sympathetic nervous system
the dorsal root of a nerve contains what type of neurons?
sensory/ afferent
this part of a neuron conducts nerve impulses towards the cell body
dendrites
A neuron going to the bicep of the forearm is part of the:
central nervous system and autonomic nervous system
the neuron pictured below is best described as
bipolar
T/F: neurons do not physically touch one another
true
describe the function and release of neurotransmitters
-neurotransmitters are chemicals stored inside secretory vesicles
(axon terminal vesicles) at the end of the axon terminals
-when neurotransmitters are released by the axon terminal vesicles,
they carry the transmission of the nerve impulse from one neuron to
another
an afferent neuron carries information:
From the peripheral to the central nervous system
a postsynaptic neuron would be found:
after the synapse
what is the location and function of satellite cells?
-PNS
-regulation of environment of neuron cell bodies
a patient's thumb was severed in a cooking accident and then
reattached during surgery. would the patient be expected to regrow
axons in their thumb? why or why not
yes; PNS nerves can regenerate the length of the axon through axonal
regeneration because of the growth of Schwann cells ahead of the axon
name and describe what is occurring in the neuron cell membrane in
section 2 of the diagram. include the charge of the membrane during
this phase
, -depolarization: the sodium gates open and sodium rushes into the
axon during the depolarization phase of the action potential
-voltage travels past zero and then on up to +40mV
at rest, a neuron plasma membrane is:
Polarized (around -70mV)
which of the following is false concerning the sodium potassium pump
the overall effect is a negative charge on the outside of the
membrane
T/F: a sensory neuron is signaling the body of a light touch. this
means that the strength of the action potential is weaker than usual.
explain your reasoning.
False. there is no variation in the strength of action potentials (it
is an all or nothing response) there is variation in the number and
frequency of neurons firing.
which of the following statements is true concerning the
neuromuscular junction
The NMJ terminates on a muscle fiber
What prevents continuous stimulation of a nerve synapse and how is
this accomplished?
the short existence of neurotransmitters in the synapse prevents
continuous stimulation. some synapses contain enzymes that rapidly
inactivate neurotransmitters and other synapses rapidly absorb the
neurotransmitter
what neurotransmitter helps regulate emotional responses and muscle
tone?
dopamine
T/F: action potentials travel in one direction within the same neuron
true
T/F: reflexes occur slower than a conscious decision to move from the
brain
false
In a reflex, the ____________ neuron conducts nerve impulses along a
pathway towards the central nervous system.
sensory/afferent
This part of a reflex is inside the CNS, made up of one or more
synapses.
integration center
which of the following statements is false about reflexes?
pulling a hand away from a hot flame is not a reflex; it is entirely
voluntary
SOLUTIONS GRADE A+
this is a collection of cell bodies found in the peripheral nervous
system
ganglia
This part of the autonomic system accelerates the heart beat and
increases breathing rate.
sympathetic nervous system
the dorsal root of a nerve contains what type of neurons?
sensory/ afferent
this part of a neuron conducts nerve impulses towards the cell body
dendrites
A neuron going to the bicep of the forearm is part of the:
central nervous system and autonomic nervous system
the neuron pictured below is best described as
bipolar
T/F: neurons do not physically touch one another
true
describe the function and release of neurotransmitters
-neurotransmitters are chemicals stored inside secretory vesicles
(axon terminal vesicles) at the end of the axon terminals
-when neurotransmitters are released by the axon terminal vesicles,
they carry the transmission of the nerve impulse from one neuron to
another
an afferent neuron carries information:
From the peripheral to the central nervous system
a postsynaptic neuron would be found:
after the synapse
what is the location and function of satellite cells?
-PNS
-regulation of environment of neuron cell bodies
a patient's thumb was severed in a cooking accident and then
reattached during surgery. would the patient be expected to regrow
axons in their thumb? why or why not
yes; PNS nerves can regenerate the length of the axon through axonal
regeneration because of the growth of Schwann cells ahead of the axon
name and describe what is occurring in the neuron cell membrane in
section 2 of the diagram. include the charge of the membrane during
this phase
, -depolarization: the sodium gates open and sodium rushes into the
axon during the depolarization phase of the action potential
-voltage travels past zero and then on up to +40mV
at rest, a neuron plasma membrane is:
Polarized (around -70mV)
which of the following is false concerning the sodium potassium pump
the overall effect is a negative charge on the outside of the
membrane
T/F: a sensory neuron is signaling the body of a light touch. this
means that the strength of the action potential is weaker than usual.
explain your reasoning.
False. there is no variation in the strength of action potentials (it
is an all or nothing response) there is variation in the number and
frequency of neurons firing.
which of the following statements is true concerning the
neuromuscular junction
The NMJ terminates on a muscle fiber
What prevents continuous stimulation of a nerve synapse and how is
this accomplished?
the short existence of neurotransmitters in the synapse prevents
continuous stimulation. some synapses contain enzymes that rapidly
inactivate neurotransmitters and other synapses rapidly absorb the
neurotransmitter
what neurotransmitter helps regulate emotional responses and muscle
tone?
dopamine
T/F: action potentials travel in one direction within the same neuron
true
T/F: reflexes occur slower than a conscious decision to move from the
brain
false
In a reflex, the ____________ neuron conducts nerve impulses along a
pathway towards the central nervous system.
sensory/afferent
This part of a reflex is inside the CNS, made up of one or more
synapses.
integration center
which of the following statements is false about reflexes?
pulling a hand away from a hot flame is not a reflex; it is entirely
voluntary
