Med surg Nervous System
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 inhibitory postsynaptic potential (IPSP) is associated with ________.
-hyperpolarization
Schwann cells are functionally similar to
oligodendrocytes
If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length
of the axon ________.
the impulse would spread bidirectionally
The effect of acetylcholine can be stimulating or inhibiting. Which gives the best explanation for why this
is so?
Different post synaptic cells will have different receptors
Which is not a function of the autonomic nervous system?
innervation of skeletal muscle
When a neurotransmitter like acetylcholine is acting in an excitatory manner which is likely a result of
the acetylcholine acting on the post synaptic cell?
Chemically gated sodium channels will open
Which is not a characteristic of neurons?
They are mitotic
Which neurotransmitter inhibits pain and is mimicked by morphine, heroin, and methadone?
endorphin
Which describes the nervous system integrative function?
analyzes sensory information, stores information, makes decisions
Cranial nerve 2, the optic nerve sends nerve impulses to the brain carrying information about the things
we see. These nerve fibers most likely belong to which division of the nervous system?
sensory (afferent) division
, These cells in the CNS have cilia that move in order to circulate cerebrospinal fluid ________.
ependymal cells
Which is not a chemical class of neurotransmitters?
nucleic acid
During the relative refractory period of an action potential, a larger than normal stimulus is needed to
cause another action potential. This is due to the fact that ________.
the voltage gated potassium ion channels remain open long enough to hyper-polarize the axon
membrane
Which will occur when an excitatory post synaptic (EPSP) is being generated on the dendritic
membrane?
A single single type of channel will open, permitting simultaneous flow of sodium and potassium
Which is not true of graded potentials?
The increase amplitude as they move away from the stimulus point
Which ion channel opens in response to a change in membrane potential and participates in the
generation and conduction of action potentials?
voltage-gated channel
Nerve impulses leading to the brain carry information about cool temperatures on the skin. The nerve
fibers sending these signals will most likely belong to which division of the nervous system?
sensory (afferent) division
Meningitis can be caused by infection of the central nervous system by bacteria. Which cells would be
most responsible for removing the infection?
microglia
Which is not a function of the astrocytes?
provide the defense for the CNS
Like all cells, the neurons' internal organization dictates its function. Neurons have relatively many
mitochondria, an extensive network of rough endoplasmic reticulum and many clusters of ribosomes.
These cellular features indicate all of the following EXCEPT ________.
neurons have stable, relatively unchanging internal environment
Bacteria in the blood can be prevented entry to the fluids surrounding the brain. Which cells are most
responsible for preventing bacteria from entering the fluids of the brain?
astrocytes
The term central nervous system refers to the
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 inhibitory postsynaptic potential (IPSP) is associated with ________.
-hyperpolarization
Schwann cells are functionally similar to
oligodendrocytes
If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length
of the axon ________.
the impulse would spread bidirectionally
The effect of acetylcholine can be stimulating or inhibiting. Which gives the best explanation for why this
is so?
Different post synaptic cells will have different receptors
Which is not a function of the autonomic nervous system?
innervation of skeletal muscle
When a neurotransmitter like acetylcholine is acting in an excitatory manner which is likely a result of
the acetylcholine acting on the post synaptic cell?
Chemically gated sodium channels will open
Which is not a characteristic of neurons?
They are mitotic
Which neurotransmitter inhibits pain and is mimicked by morphine, heroin, and methadone?
endorphin
Which describes the nervous system integrative function?
analyzes sensory information, stores information, makes decisions
Cranial nerve 2, the optic nerve sends nerve impulses to the brain carrying information about the things
we see. These nerve fibers most likely belong to which division of the nervous system?
sensory (afferent) division
, These cells in the CNS have cilia that move in order to circulate cerebrospinal fluid ________.
ependymal cells
Which is not a chemical class of neurotransmitters?
nucleic acid
During the relative refractory period of an action potential, a larger than normal stimulus is needed to
cause another action potential. This is due to the fact that ________.
the voltage gated potassium ion channels remain open long enough to hyper-polarize the axon
membrane
Which will occur when an excitatory post synaptic (EPSP) is being generated on the dendritic
membrane?
A single single type of channel will open, permitting simultaneous flow of sodium and potassium
Which is not true of graded potentials?
The increase amplitude as they move away from the stimulus point
Which ion channel opens in response to a change in membrane potential and participates in the
generation and conduction of action potentials?
voltage-gated channel
Nerve impulses leading to the brain carry information about cool temperatures on the skin. The nerve
fibers sending these signals will most likely belong to which division of the nervous system?
sensory (afferent) division
Meningitis can be caused by infection of the central nervous system by bacteria. Which cells would be
most responsible for removing the infection?
microglia
Which is not a function of the astrocytes?
provide the defense for the CNS
Like all cells, the neurons' internal organization dictates its function. Neurons have relatively many
mitochondria, an extensive network of rough endoplasmic reticulum and many clusters of ribosomes.
These cellular features indicate all of the following EXCEPT ________.
neurons have stable, relatively unchanging internal environment
Bacteria in the blood can be prevented entry to the fluids surrounding the brain. Which cells are most
responsible for preventing bacteria from entering the fluids of the brain?
astrocytes
The term central nervous system refers to the
