Bio 161 Exam 3 Practice Questions
100% guaranteed pass
In a chemical synapse, the axon terminal of the presynaptic neuron is in direct
contact with (i.e., is directly touching) the dendrite of the postsynaptic neuron.
True/false - answerFalse
What molecules are located INSIDE synaptic vesicles?
Calcium ions
Neurotransmitters
Phopholipids
Sodium ions - answerNeurotransmitters
In a resting (or unexcited) neuron, calcium is at a higher concentration
______________ of the cell.
Inside
Outside - answerOutside
What molecule DIRECTLY causes a vesicle to merge (or fuse) to the membrane of
the presynaptic neuron?
Sodium ion
Potassium ion
Calcium ion - answerCalcium ion
Released neurotransmitters will travel through ion channels of the postsynaptic
neuron and enter the cytoplasm of that cell.
True/false - answerFalse
Neurotransmitters released from a presynaptic cell bind to ______protein channels
located in the membrane of the postsynaptic cell.
A. voltage-gated
B. chemical-gated
C. both voltage-gated and chemical-gated
D. mechanical-gated
E. All of these are correct - answerB
What channels would open in a postsynaptic cell during an EPSP (before threshold
is reached)?A.Sodium chemical-gated
B.Potassium voltage-gated
C.Sodium voltage-gated
D.Potassium chemical-gated - answerA
At one postsynaptic neuron, the total EPSP change from RMP is +45mV and the
total IPSP change from RMP is -15mV. Will an action potential be triggered?
Assume RMP equals -70mV and threshold is -55mV. (Hint - remember that EPSPs
and IPSPs are happening at the same time.)
A. Yes
, B. No - answerA
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?
Sodium
Potassium
Calcium
Protein anions - answerCalcium
Binding of neurotransmitters to channels will immediately cause a(n)
_________________ to occur in the postsynaptic neuron.
action potential
local potential
resting potential - answerlocal potential
Neurotransmitters will bind to which of the following type of protein channels in the
postsynaptic cell membrane?
Voltage-gated channels
Chemical-gated channels
Mechanically-gated channels
Protein pumps - answerChemical gated
What major event leads to the release of neurotransmitters in the synapse?
A inhibitory local potential in the presynaptic neuron.
The opening of chemical-gated calcium channels.
Hyperpolarization of the presynaptic neuron.
An action potential in the presynaptic neuron. - answerD
All neurotransmitters will excite the postsynaptic neuron.
True/false - answerFalse
Sympathetic and parasympathetic neurons are what type of neuron?
Afferent neurons
Interneurons
Efferent neurons - answerEfferent neurons
The autonomic nervous system targets cardiac tissue.
True/false - answerTrue
Which part of the autonomic nervous system consists of ganglia close to the spinal
cord?
Sympathetic
Parasympathetic - answerSympathetic
Activation of sweat glands is considered a _____________________ response.
sympathetic
parasympathetic - answerSympathetic
Rest and digest responses are considered part of the parasympathetic nervous
system.
100% guaranteed pass
In a chemical synapse, the axon terminal of the presynaptic neuron is in direct
contact with (i.e., is directly touching) the dendrite of the postsynaptic neuron.
True/false - answerFalse
What molecules are located INSIDE synaptic vesicles?
Calcium ions
Neurotransmitters
Phopholipids
Sodium ions - answerNeurotransmitters
In a resting (or unexcited) neuron, calcium is at a higher concentration
______________ of the cell.
Inside
Outside - answerOutside
What molecule DIRECTLY causes a vesicle to merge (or fuse) to the membrane of
the presynaptic neuron?
Sodium ion
Potassium ion
Calcium ion - answerCalcium ion
Released neurotransmitters will travel through ion channels of the postsynaptic
neuron and enter the cytoplasm of that cell.
True/false - answerFalse
Neurotransmitters released from a presynaptic cell bind to ______protein channels
located in the membrane of the postsynaptic cell.
A. voltage-gated
B. chemical-gated
C. both voltage-gated and chemical-gated
D. mechanical-gated
E. All of these are correct - answerB
What channels would open in a postsynaptic cell during an EPSP (before threshold
is reached)?A.Sodium chemical-gated
B.Potassium voltage-gated
C.Sodium voltage-gated
D.Potassium chemical-gated - answerA
At one postsynaptic neuron, the total EPSP change from RMP is +45mV and the
total IPSP change from RMP is -15mV. Will an action potential be triggered?
Assume RMP equals -70mV and threshold is -55mV. (Hint - remember that EPSPs
and IPSPs are happening at the same time.)
A. Yes
, B. No - answerA
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?
Sodium
Potassium
Calcium
Protein anions - answerCalcium
Binding of neurotransmitters to channels will immediately cause a(n)
_________________ to occur in the postsynaptic neuron.
action potential
local potential
resting potential - answerlocal potential
Neurotransmitters will bind to which of the following type of protein channels in the
postsynaptic cell membrane?
Voltage-gated channels
Chemical-gated channels
Mechanically-gated channels
Protein pumps - answerChemical gated
What major event leads to the release of neurotransmitters in the synapse?
A inhibitory local potential in the presynaptic neuron.
The opening of chemical-gated calcium channels.
Hyperpolarization of the presynaptic neuron.
An action potential in the presynaptic neuron. - answerD
All neurotransmitters will excite the postsynaptic neuron.
True/false - answerFalse
Sympathetic and parasympathetic neurons are what type of neuron?
Afferent neurons
Interneurons
Efferent neurons - answerEfferent neurons
The autonomic nervous system targets cardiac tissue.
True/false - answerTrue
Which part of the autonomic nervous system consists of ganglia close to the spinal
cord?
Sympathetic
Parasympathetic - answerSympathetic
Activation of sweat glands is considered a _____________________ response.
sympathetic
parasympathetic - answerSympathetic
Rest and digest responses are considered part of the parasympathetic nervous
system.
