Deck 27: Nervous Tissue and Nerves

Question 1

Which of the following is true of interneurons?

A)They are only found in the peripheral nervous system.
B)They are also called efferent neurons.
C)They often connect sensory neurons to motor neurons.
D)They are directly connected to sensory receptors.
E)None of the choices is true of interneurons.

Answer 1

C

Question 2

Which portion of a neuron originates action potentials (nerve impulses), to send to other neurons, glands, or muscle cells?

A)Nucleolus
B)Dendrite
C)Neurilemma
D)Axon hillock
E)Nissl bodies (chromatophilic substance)

Answer 2

D

Question 3

Which type of neuroglial cell has a cuboidal shape?

A)Microglia
B)Schwann cells
C)Ependymal cells
D)Oligodendrocytes
E)Astrocytes

Answer 3

C

Question 4

A nerve is the same structure as a neuron.

Question 5

Which type of neuroglia forms the myelin sheath around some axons of the PNS (peripheral nervous system)?

A)Schwann cells
B)Astrocytes
C)Satellite cells
D)Oligodendrocytes
E)Ependymal cells

Question 6

Neurons conduct action potentials (nerve impulses), but neuroglia do not.

Question 7

Pertaining to the nervous system, what is an effector?

A)A cell or nerve ending that transmits sensory information to a sensory neuron
B)An interneuron
C)A motor neuron
D)A type of neuroglia that physically supports neurons in the CNS
E)A muscle or gland that receives a nerve impulse from a motor neuron

Question 8

Cranial and spinal nerves are part of the central nervous system (CNS).

Question 9

A peripheral process is a structure found only in ________ neurons.

A)bipolar
B)motor
C)multipolar
D)association
E)unipolar

Question 10

The rarest structural type of neuron is a bipolar neuron.

Question 11

Exchange of nutrients and other substances between CNS neurons and blood vessels is accomplished by

A)microglia.
B)oligodendrocytes.
C)satellite cells.
D)astrocytes.
E)Schwann cells.

Question 12

Which type of neuron conducts nerve impulses from the central nervous system to muscles or glands?

A)Afferent neurons
B)Association neurons
C)Sensory neurons
D)Interneurons
E)Motor neurons

Question 13

All structural types of neurons contain only one axon.

Question 14

A bundle of nerve fibers is surrounded by a layer of fibrous connective tissue called the

A)epineurium.
B)fascicle.
C)endoneurium.
D)neurilemma.
E)perineurium.

Question 15

Which of the following is NOT true of the myelin sheath?

A)The myelin sheath increases the speed of nerve impulse conduction.
B)The myelin sheath is an electric insulator.
C)The myelin sheath forms a wrapped coating around both axons and dendrites.
D)The myelin sheath is part of a living cell.
E)All of these are true of the myelin sheath.

Question 16

What is the function of ependymal cells?

A)They are the phagocytes of the brain.
B)They produce cerebrospinal fluid, and circulate it around the brain and spinal cord.
C)They produce the myelin sheath around axons of the peripheral nervous system.
D)They support the cell bodies of neurons in peripheral ganglia.
E)They produce the myelin sheath around axons of the central nervous system.

Question 17

Neurons that have one dendrite and one axon extending from the cell body are called ________ neurons.

A)multipolar
B)efferent
C)bipolar
D)association
E)unipolar

Question 18

Nodes of Ranvier are found only on

A)myelinated axons.
B)dendrites.
C)astrocytes.
D)Nissl bodies.
E)unmyelinated axons.

Question 19

What is found in the posterior root ganglion of a spinal nerve?

A)A cluster of sensory neuron cell bodies
B)A mass of axons of motor neurons
C)A cluster of cell bodies of interneurons
D)A cluster of motor neuron cell bodies
E)A mass of axons of interneurons

Question 20

Sensory neurons are

A)always multipolar.
B)mostly unipolar, but some are bipolar.
C)always unipolar.
D)mostly multipolar, but some are bipolar.
E)always bipolar.