Untitled Quiz

The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.

Reflexes are rapid, automatic responses to stimuli.

Efferent nerve fibers may be described as motor nerve fibers.

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.

During depolarization, the inside of the neuron's membrane becomes less negative.

Neurons in the CNS are organized into functional groups.

Strong stimuli cause the amplitude of action potentials generated to increase.

The oligodendrocytes can myelinate several axons.

Enkephalins and endorphins are peptides that act like morphine.

In myelinated axons, the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers.

The nodes of Ranvier are found only on myelinated, peripheral neuron processes.

Unipolar neurons have axons structurally divided into peripheral and central processes.

A stimulus traveling toward a synapse appears to open calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane.

If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them.

The overlapping functions of the nervous system are sensory input, integration, and motor output.

The autonomic nervous system is under voluntary control; whereas, the somatic nervous system is involuntary.

Axon diameter and degree of myelination determine nerve impulse conduction velocity.

The action potential is caused by permeability changes in the plasma membrane.

Some neurotransmitters can be either excitatory or inhibitory depending upon the receptor.

Which of the following is not a function of astrocytes?

Which of the choices below describes the ANS?

What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called?

What does the central nervous system use to determine the strength of a stimulus?

Bipolar neurons are commonly ______.

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?

Which of the following describes the nervous system integrative function?

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ______.

Which of the following is not characteristic of neurons?

The part of a neuron that conducts impulses away from its cell body is called a(n) ______.

Which ion 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 ______.

What is the role of acetylcholinesterase?

Which of the following 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 ______.

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) ______.

Saltatory conduction is made possible by ______.

Which of the following is not a chemical class of neurotransmitters?

Which of the following is false or incorrect?

Select the correct statement regarding synapses.

Which of the following correctly 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, which cellular gates open?

Nerve cell adhesion molecules (N-CAMs) ______.

An inhibitory postsynaptic potential (IPSP) is associated with ______.

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) ______.

Which of the following is not true of graded potentials?

Which of the following is true about the movement of ions across excitable living membranes?

A second nerve impulse cannot be generated until ______.

In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment?

If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ______.

Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?

Which of the following describes the excitatory postsynaptic potential?

That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ______ nervous system.

Neuroglia found in the CNS that bind axons and blood vessels to each other are called ______.

A chemical messenger that does not directly cause ESPSs or IPSPs but does affect the strength of synaptic transmission is a ______.

The synapse more common in embryonic nervous tissue than in adults is the ______.

When information is delivered within the CNS simultaneously by different parts of the neural pathway, the process is called ______ processing.

Potentials that are short-lived, local changes in membrane potential that can be either depolarized or hyperpolarized are called ______ potentials.

When one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the postsynaptic membrane than would result from a single EPSP; this event is called ______ summation.