BSC 2085C Exam 3 Review questions
and answers
What does the central nervous system use to determine the strength of a
stimulus?✔✔frequency of actions potentials
Nerve impulses are sent to slow the heart's rate of contraction. The nerve fibers
sending these signals will most likely belong to which division of the nervous
system?✔✔parasympathetic division
An action potential is regarded as an example of a positive feedback. Which of the
following examples below best illustrates the positive feedback of an action
potential?✔✔A threshold stimulus will cause the opening of voltage gated sodium ion
channels that will cause further depolarizing stimulus. This stimulus will open more
voltage gated sodium ion channels.
The effect of acetylcholine can be stimulating or inhibiting. Which of the following
gives the best explanation for why this so?✔✔different postsynaptic cells will have
different receptors
Which of the following is NOT a function of the autonomic nervous
system?✔✔innervation of skeletal muscle
Which of the following is NOT true of graded potentials?✔✔They increase amplitude
as they move away from the stimulus point
It is important for newly developed neurons to form synapses with other neurons.
Which cells are most responsible for guiding formation of these particular
joints?✔✔astrocytes
The interior surface of a neuron's plasma membrane at resting membrane potential
will have a✔✔negative charge and contains less sodium outside of the cell
The period after an initial stimulus when a neuron is not sensitive to another stimulus
is the✔✔absolute refractory period
If a postsynaptic neuron is stimulated to threshold by spatial summation this implies
that ________.✔✔the postsynaptic cell has many synapses with many presynaptic
neurons
When a neurotransmitter like acetylcholine is acting in an excitatory manner which of
the following is likely a result of the acetylcholine acting on the post synaptic
cell?✔✔Chemically gated sodium channels will open
Meningitis can be caused by infection of the central nervous system by bacteria.
Which cells would be most responsible for removing the infection?✔✔microglia
and answers
What does the central nervous system use to determine the strength of a
stimulus?✔✔frequency of actions potentials
Nerve impulses are sent to slow the heart's rate of contraction. The nerve fibers
sending these signals will most likely belong to which division of the nervous
system?✔✔parasympathetic division
An action potential is regarded as an example of a positive feedback. Which of the
following examples below best illustrates the positive feedback of an action
potential?✔✔A threshold stimulus will cause the opening of voltage gated sodium ion
channels that will cause further depolarizing stimulus. This stimulus will open more
voltage gated sodium ion channels.
The effect of acetylcholine can be stimulating or inhibiting. Which of the following
gives the best explanation for why this so?✔✔different postsynaptic cells will have
different receptors
Which of the following is NOT a function of the autonomic nervous
system?✔✔innervation of skeletal muscle
Which of the following is NOT true of graded potentials?✔✔They increase amplitude
as they move away from the stimulus point
It is important for newly developed neurons to form synapses with other neurons.
Which cells are most responsible for guiding formation of these particular
joints?✔✔astrocytes
The interior surface of a neuron's plasma membrane at resting membrane potential
will have a✔✔negative charge and contains less sodium outside of the cell
The period after an initial stimulus when a neuron is not sensitive to another stimulus
is the✔✔absolute refractory period
If a postsynaptic neuron is stimulated to threshold by spatial summation this implies
that ________.✔✔the postsynaptic cell has many synapses with many presynaptic
neurons
When a neurotransmitter like acetylcholine is acting in an excitatory manner which of
the following is likely a result of the acetylcholine acting on the post synaptic
cell?✔✔Chemically gated sodium channels will open
Meningitis can be caused by infection of the central nervous system by bacteria.
Which cells would be most responsible for removing the infection?✔✔microglia
