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Flashcards in nervous tissue - practice Qs Deck (22):
1

the nervous system
a. works with the endocrine system to maintain homeostasis
b. communicates with the body via action potentials
c. is responsible for thoughts and behaviors
d. initiates voluntary movements
e. all of the above

E

2

each of the following is a part of the nervous system except
a. brain
b. spinal cord
c. vertebral column
d. neurons
e. neuroglia

C

3

which of the following correctly describes a function of the nervous system
a. sensory: detect changes in the environment; relays information to the brain and spinal cord
b. integrative: elicits an appropriate response such as muscle contraction or glandular secretion
c. motor: process and make decisions regarding sensory input; responsible for perception
d. a and b are correct
e. a, b, and c are correct

A

4

the CNS
a. excludes the cranial and spinal nerves, ganglia and sensory receptors
b. is the source of thoughts and emotions
c. is the destination of action potentials from motor neurons
d. a and b are correct
e. a, b, and c are correct

D

5

the PNS
a. includes the brain and spinal cord
b. may be divided into somatic, autonomic, and enteric nervous systems
c. is only involved with unconsious (involuntary) activities
d. a and b are correct
e. a, b, and c are correct

B

6

the somatic nervous system
a. provides motor signals and conscious control to skeletal muscles
b. includes sympathetic and parasympathetic divisions
c. regulates the gastrointestinal tract
d. is dependent on the autonomic system for control
e. includes motor neurons to smooth muscles

A

7

neurons
a. are electrically excitable cells
b. vary greatly in size
c. have a perikaryon enriched with the organelles for protein synthesis
d. a and b are correct
e. a, b, and c are correct

E

8

which of the following is not true
a. a dendrite is a nerve fiber that receives impulses from other neurons
b. most neurons have many axons and one dendrite
c. an axon sends an impulse to another neuron or to an effector cell
d. slow axonal transport moves axoplasm in only one direction
e. fast axonal trasnport uses microtubules to move materials in two directions

B

9

which of the following is true of a synapse
a. the presynaptic neuron carries a nerve impulse away from a synapse
b. the postsynaptic neuron carries nerve impulses toward a synapse
c. a synapse is the site of where two neurons or a neuron and an effector meet
d. the presynaptic neuron releases chemical messengers called hormones
e. the synapse of a neuron and a gland is called a neuromuscular junction

C

10

most of the neurons in the brain and spinal cord are _____ neurons
a. anaxonic
b. bipolar
c. purkinje cells
d. multipolar
e. univocal

D

11

neuroglia
a. comprise about one-half of the tissue in the CNS
b. retain mitotic potential but do not conduct nerve impulses
c. support and protect neurons
d. a and b are correct
e. a, b, and c are correct

E

12

astrocytes
a. support neurons in the peripheral nervous system
b. form the blood-brain barier
c. regulate growth, migration and interconnection of neurons in the adult brain
d. form myelin on central nervous system neurons
e. maintain the blood-cerebrospinal fluid barrier

B

13

which neuroglia cells produce myelin
a. oligodendrocytes
b. schwann cells
c. satellite cells
d. a and b are correct
e. a, b, and c are correct

D

14

grey matter
a. consists of neuron cell bodies, neuroglia and unmyelinated nerve fibers
b. is found at the periphery of the spinal cord
c. may be found in clusters called ganglia in the CNS
d. may be found in clusters called nuclei in the PNS
e. all of the above

A

15

which of the following is not classified as a small molecule neurotransmitter
a. acetylcholine
b. aspartate
c. substance P
d. adenosine triphosphate
e. norepinephrine

C

16

acetylcholine
a. is released from some CNS neurons and most PNS neurons
b. is excitatory at skeletal muscle motor end plates
c. is inhibitory where the vagus (X) nerve synapses with cardiac fibers
d. is removed from synapses by the enzyme, acetylcholinesterase
e. all of the above

E

17

each of the following is an amino acid that functions as a neurotransmitter except
a. enkephalin
b. gylcine
c. GABA
d. aspartate
e. glutamate

A

18

biogenic amines
a. are modified fatty acids
b. include epinephrine, norepinephrine, serotinin, and dopamine
c. each bind to only one type of receptor
d. have excitatory effectse. A and ba are correct

B

19

norepinephrine
a. is required for the loss of consciousness that allows us to sleep
b. is used by fewer neurons in the brain; more neurons use epinephrine
c. and epinephrine are also made by the adrena glands and can be considered hormones
d. a and b are correct
e. a, b, and c are correct

C

20

in order for a neuron to regenerate
a. it must be in the PNS
b. the cell body myst remain intact
c. the schwann cell must cease myelin production
d. a and b are correct
e. a, b, and c are correct

D

21

neurogenesis
a. occurs in the embryonic brain
b. occurs in the hippocampus even during adulthood
c. is inhibited by neuroglial products in most areas of the CNS
d. is inhibited by the absence of fetal growth stimulating factors
e. all of the above

E

22

epilepsy
a. is an autoimmune disorder
b. results from abnormal, synchronous discharge of neurons in the brain
c. results in muscle weakness
d. rarely causes seizures
e. is usually observed in a relapsing-remitting form

B