Astrocytes provide the defense for the
The ANS motor fibers conduct nerve impulses from the CNS to
smooth muscle, cardiac muscle, and glands.
Ependymal cells are
ciliated CNS neuroglia that plays an active role in moving the cerebrospinal fluid.
The central nervous system uses frequency of action potentials to determine the strength of a
Bipolar neurons are commonly found in the
retina of the eye
Acetylcholine is an
excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle.
The nervous system integrative function
analyzes sensory information, stores information, makes decisions.
The period after an initial stimulus when a neuron is not sensitive to another stimulus is the
absolute refractory period.
The part of a neuron that conducts impulses away from its cell body is called an
A voltage-gated channel
opens in response to a change in membrane potential and participates in the generation and conduction of action potentials.
An impulse from one nerve cell is communicated to another nerve cell via the
The role of acetylcholinesterase is
to destroy ACh a brief period after its release by the axon endings.
Innervation of skeletal muscle is not a function of
the autonomic nervous system
Collections of nerve cell bodies outside the central nervous system are called
The term central nervous system refers to
the brain and spinal cord
The substance released at axon terminals to propagate a nervous impulse is called a
A neuron that has as its primary function the job of connecting other neurons is called an
Saltatory conduction is made possible by
the myelin sheath
Nucleic acid is not a
chemical class of neurotransmitters
The synaptic cleft prevents
an impulse from being transmitted directly from one neuron to another.
Amplitude of various sizes describes
a graded potential
Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are
Schwann cells are functionally similar to
Immediately after an action potential has peaked
potassium cellular gates open
Nerve cell adhesion molecules (N-CAMs) are crucial for the development of
An inhibitory postsynaptic potential (IPSP) is associated with
excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane a single type of channel will open
permitting simultaneous flow of sodium and potassium.
When a sensory neuron is excited by some form of energy, the resulting graded potential is called a
Graded potentials decrease amplitude as they move away from
the stimulus point
Sodium gates in the membrane can open in response to
electrical potential changes
A second nerve impulse cannot be generated
until the membrane potential has been reestablished.
How does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment?
The interior is negatively charged and contains less sodium.
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
Endorphin neurotransmitters inhibit pain and are mimicked by
morphine, heroin, and methadone.
Short distance depolarization describes
the excitatory postsynaptic potential