Question 1

____________________ cells form myelin around neurons in the peripheral nervous system.

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Question 2

Schwann cells stimulate the formation of a(n) ____________________ tube to rebuild damaged neurons.

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Question 3

The ____________________hormones are derived from tyrosine.

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Question 4

Neuropeptides are large, ____________________-acting molecules.

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Question 5

Repeated firings of one presynaptic neuron can produce ____________________ summation.

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Question 6

Axon terminal possess ____________________ voltage-gated channels that when operational induce neurotransmitter release.

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Question 7

Neurotransmitters are small, ____________________-acting molecules.

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Question 8

The neuronal relationship where many presynaptic cells terminate on a single postsynaptic cell is called ____________________.

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Question 9

A neuron fires an impulse by the all-or-____________________ law.

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Question 10

The neuronal relationship where a single presynaptic cell branches to terminate on many other cells is called ____________________.

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Question 11

____________________ are chemical messengers that bind to neuronal receptors at nonsynaptic sites and alter the effectiveness of ongoing synaptic activity.

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Question 12

____________________ are molecules produced by nerve cells and bind to nonsynaptic receptors.

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Question 13

____________________ is a pathophysiological condition in which nerve cells lose their myelin sheath.

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Question 14

Steroid hormones are derived from ____________________.

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Question 15

When EPSPs originating from a single presynaptic input occur so close together in time that they add together or sum, thereby bringing the postsynaptic cell to threshold, it is called ____________________.

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Question 16

Myelinated fibers conduct impulses about ____________________ times faster than unmyelinated fibers of the same diameter.

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Question 17

At the synapse, a presynaptic neuron signals a(n) ____________________ neuron.

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Question 18

When EPSPs occurring simultaneously from two different presynaptic inputs add together or sum to bring the postsynaptic cell to threshold, it is called ____________________.

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Question 19

A given synapse is always excitatory or ____________________.

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Question 20

____________________ are the myelin-forming cells in the central nervous system, whereas ____________________ are the myelin-forming cells in the peripheral nervous system.

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Quiz 4: Principles of Neural and Hormonal Communication