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Neurons that have several dendrites and a single axon

multipolar

Cholinergic synapses release the neurotransmitter

acetylcholine

Glial cell that is found lining the ventricles and spinal canal

ependymal cells

The brain and spinal cord comprise the ________ nervous system.

central nervous system (CNS)

The neurilemma of axons in the peripheral nervous system is formed by

Schwann cells.

________ neurons are the most common neuron in the CNS.

Multipolar

Cells responsible for information processing and transfer are the

neurons

EPSPs (excitatory postsynaptic potentials) occur when

sodium channels are opened.

IPSPs (inhibitory postsynaptic potentials)

result in local hyperpolarizations.

The sodium-potassium exchange pump

requires ATP to function.

Bundles of axons in the spinal cord are called

tracts.

The part of the peripheral nervous system that brings information to the central nervous system is

afferent.

The all-or-none principle states that

all stimuli great enough to bring the membrane to threshold will produce identical action potentials.

The ion needed to initiate the release of acetylcholine into the synaptic cleft is

calcium

________ neurons are rare, but occur in special sense organs.

bipolar

Voluntary control of skeletal muscles is provided by the ________ nervous system.

somatic

Voltage-regulated channels can be found

in the membrane that covers axons.

The effect that a neurotransmitter has on the postsynaptic membrane depends on

the characteristics of the receptors.

Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called

unipolar

What happends during saltatory conduction?

action potentials occur at successive nodes along the length of the stimulated axon.

Where are Interneurons found?

found only in the central nervous system

Opening of sodium channels in the membrane of a neuron

depolarization

________ neurons form the afferent division of the PNS.

Sensory

Neurotransmitters are released from the

synaptic knobs

The axon is connected to the soma by the

hillock.

Adrenergic synapses release the neurotransmitter

norepinephrine

Most neurons lack centrioles.

Why do neurons do not regenerate?

The site of intercellular communication between neurons is the

synapse

The effect of a particular neurotransmitter is dependent upon the properties of the ________, not the ________.

receptor; neurotransmitter

Which type of synapse dominates the nervous system?

chemical

At the normal resting potential of a typical neuron, its ion exchange pump transports

3 intracellular sodium ions for 2 extracellular potassium ions

The myelin sheaths that surround the axons of some of the neurons in the CNS are formed by

oligodendrocytes.

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