Chapter 11 Nervous System Flashcards


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1

Directacting
neurotransmitters ________.

C) open ion channels to provoke rapid responses

2

2) Which of the following is correct relative to Ohmʹs law?

B) Current is directly proportional to the voltage.

3

3) Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are
called
________.

A) ependymal cells

4

The sheath of Schwann is also called the ________.

C) neurilemma

5

Bipolar neurons are commonly ________.

D) found in the retina of the eye

6

An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is
________.

C) acetylcholine

7

A neural circuit in which a single impulse is transmitted over and over is a ________.

D) absolute refractory period

8

A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather
small number of neurons is called a(n) ________.

C) converging circuit

9

Which of the following is not a structural feature of a neuron?

A) synaptic cleft

10

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

A) axon

11

The chemically gated channel, NMDA, allows ________ ions entry into the nerve cell.

C) Ca2+

12

The point at which an impulse from one nerve cell is communicated to another nerve cell is
the
________.

B) synapse

13

The role of acetylcholinesterase is to ________.

C) ganglia

14

The term central nervous system refers to the ________.

C) brain and spinal cord

15

The substance released at axon terminals to propagate a nervous impulse is called a(n)
________.

C) neurotransmitter

16

A neuron that has as its primary function the job of connecting other neurons is called a(n)
________.

C) association neuron

17

Saltatory conduction is made possible by ________.

A) the myelin sheath

18

Which of these ions is actively transported through the cell membrane to establish a resting
potential?

A) Na

19

The part of the neuron that normally receives stimuli is called ________.

B) a dendrite

20

Choose the statement that is most correct about membrane potential.

B) Voltage would be measured by placing one electrode inside the membrane and another
outside the membrane.

21

The sodiumpotassium
pump ________.

A) pumps three sodium ions outside the cell and two potassium ions inside

22

An action potential ________.

A) is essential for impulse propagation

23

Select the correct statement about synapses.

D) The synaptic cleft prevents an impulse from being transmitted directly from one neuron
to another.

24

Which of the following is a good example of a neuromodulator?

D) nitric oxide

25

Which group of fibers spreads impulses at up to 1 meter per second?

C) group C fibers

26

Ependymal cells ________.

D) help to circulate the cerebrospinal fluid

27

Neuroglia that control the chemical environment around neurons by buffering potassium
and recapturing neurotransmitters are ________.

A) astrocytes

28

Schwann cells are functionally similar to ________.

C) oligodendrocytes

29

Immediately after an action potential has peaked, which cellular gates open?

D) potassium

30

Nerve cell adhesion molecules (NCAMs)
________.

D) are crucial for the development of neural connections

31

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

B) hyperpolarization

32

Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being
generated on the dendritic membrane?

D) A single type of channel will open, permitting simultaneous flow of sodium and
potassium.

33

When a sensory neuron is excited by some form of energy, the resulting graded potential is

D) generator potential

34

All of the following are true of graded potentials except that they ________.

C) increase amplitude as they move away from the stimulus point

35

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

B) Some ions are prevented from moving down their concentration gradients by
ATP driven pumps.

36

________ is an indolamine.

C) Serotonin

37

A second nerve impulse cannot be generated until ________.

A) the membrane potential has been reestablished

38

In what way does the interior surface of a cell membrane of a resting (nonconducting)

B) negatively charged and contains less sodium

39

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

C) the impulse would spread bidirectionally

40

Neurons may be classified according to several characteristics. Which of the following is
correct?

C) Group C fibers are not capable of saltatory conduction.

41

Select the correct statement about serial processing.

A) Spinal reflexes are an example of serial processing.

42
card image

Using Figure 11.1, match the following:
1) Which neuron would connect to a muscle?
2) Which neuron would be found in the retina of the eye?
3) Which neuron is a sensory neuron found in a reflex arc?
4) Which neuron is never myelinated?

1) Answer: A
2) Answer: B
3) Answer: C
4) Answer: B

43
card image

Using Figure 11.1, match the following:

5) Which neuron is rare?
6) In a reflex arc, which neuron has its cell body inside the spinal cord?
7) Which neuron is common only in dorsal root ganglia of the spinal cord and sensory
ganglia of
cranial nerves?
8) Which is by far the most common neuron type?

5) Answer: B
6) Answer: A
7) Answer: C
8) Answer: A

44
card image

Using Figure 11.2, match the following:
9) Ion channel.
10) Synaptic vesicles.
11) Calcium ions.
12) Postsynaptic membrane.
13) Synaptic cleft.

9) Answer: E
10) Answer: C
11) Answer: A
12) Answer: B
13) Answer: D

45

14) Neurotransmitters are
released at the ________.

D) Axon terminal

46

15) The rough ER of the cell.

A) Nissl bodies

47

16) Receptive region of the
neuron.

B) Dendrites

48

17) Conducting region of the
neuron.

C) Axon

49

18) Period during which the
neuron cannot respond to a
second stimulus, no matter
how strong.

B) Absolute refractory period

50

19) The interior of the cell becomes less negative due to an influx of sodium ions.

E) Depolarization

51

20) The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability

C) Repolarization

52

21) Also called a nerve impulse
transmitted by axons.

D) Action potential

53

22) An exceptionally strong
stimulus can trigger a
response.

A) Relative refractory period

54

23) Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect.

A) Temporal summation

55

24) Stimulation of a postsynaptic neuron by many terminals at the same time.

B) Spatial summation

56

25) An insufficient stimulus.

D) Subthreshold stimulus

57

26) Any stimulus below this intensity will result in no
response in a neuron.

C) Threshold stimulus