The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.
Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system.
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
A synapse formed between the axon ending of one neuron and the cell body of another neuron is called an axosomatic synapse.
In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.
Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes.
Voltage is always measured between two points and may be called the potential between these two points.
Neurons that are far away from the center of the neuron pool and that are not easily excited by an incoming stimulus are in the discharge zone.
The two major classes of graded potentials are transmitter potentials and receptor potentials.
A graded potential that is the result of a neurotransmitter released into the synapse between two neurons is called a postsynaptic potential.
A stimulus traveling toward a synapse appears to open calcium channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane.
A positive feedback cycle is the main force in the generation of graded potentials at receptor ends.
If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them.
Current is directly proportional to the voltage
Which of the following is correct relative to Ohm's law?
Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are called ________.
An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is ________.
A neural circuit in which a single impulse is transmitted over and over is a ________.
absolute refractory period
The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.
A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n) ________.
The point at which an impulse from one nerve cell is communicated to another nerve cell is the ________.
destroy ACh a brief period after its release by the axonal endings
The role of acetylcholinesterase is to ________.
innervation of skeletal muscle
Which of the following is not a function of the autonomic nervous system?
The substance released at axon terminals to propagate a nervous impulse is called a(n) ________.
A neuron that has as its primary function the job of connecting other neurons is called a(n) ________.
Which of these ions is actively transported through the cell membrane to establish a resting potential?
Voltage would be measured by placing one electrode inside the membrane and another outside the membrane.
Choose the statement that is most correct about membrane potential.
pumps three sodium ions outside the cell and two potassium ions inside
The sodium-potassium pump ________.
The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another.
Select the correct statement about synapses.
Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are ________.
are crucial for the development of neural connections
Nerve cell adhesion molecules (N-CAMs) ________.
A single type of channel will open, permitting simultaneous flow of sodium and potassium.
Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?
When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________.
increase amplitude as they move away from the stimulus point
All of the following are true of graded potentials except that they ________.
Some ions are prevented from moving down their concentration gradients by ATP-driven pumps.
Which of the following is true about the movement of ions across excitable living membranes?
the membrane potential has been reestablished
A second nerve impulse cannot be generated until ________.
negatively charged and contains less sodium
In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The interior is ________.
the impulse would spread bidirectionally
If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________.
Group C fibers are not capable of saltatory conduction.
Neurons may be classified according to several characteristics. Which of the following is correct?