Chapter 11 Part 7 (true or false) Flashcards Preview

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Flashcards in Chapter 11 Part 7 (true or false) Deck (22):
1

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

false

2

Reflexes are rapid, automatic responses to stimuli.
(true or false)

true

3

Efferent nerve fibers may be described as motor nerve fibers.
(true or false)

true

4

Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system.
(true or false)

true

5

Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
(true or false)

true

6

During depolarization, the inside of the neuron'ʹs membrane becomes less negative.
(true or false)

true

7

Neurons in the CNS are organized into functional groups.
(true or false)

true

8

Strong stimuli cause the amplitude of action potentials generated to increase.
(true or false)

false

9

The oligodendrocytes can myelinate several axons.
(true or false)

true

10

Enkephalins and endorphins are peptides that act like morphine.
(true or false)

true

11

In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.
(true or false)

true

12

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.
(true or false)

true

13

Large-diameter nerve fibers conduct impulses much faster than small- diameter fibers.
(true or false)

true

14

The nodes of Ranvier are found only on myelinated, peripheral neuron processes.
(true or false)

false

15

Unipolar neurons have axons structurally divided into peripheral and central processes.
(true or false)

true

16

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.
(true or false)

true

17

If bacteria invaded the CNS tissue, microglia would migrate to the area to engulf and destroy them.
(true or false)

true

18

The overlapping functions of the nervous system are sensory input, integration, and motor output.
(true or false)

true

19

The autonomic nervous system is under voluntary control; whereas, the somatic nervous system is involuntary.
(true or false)

false

20

Axon diameter and degree of myelination determine nerve impulse conduction velocity.
(true or false)

true

21

The action potential is caused by permeability changes in the plasma membrane.
(true or false)

true

22

Some neurotransmitters can be either excitatory or inhibitory depending upon the receptor.
(true or false)

true