Deck 15: Histology of Nervous Tissue

Question 1

At an axon terminal, the electrical signal from one cell .

A)is transmitted directly to the next cell by strands of membrane
B)ends and the signal it carried is not transmitted to another cell
C)jumps from the axon terminal to the next cell
D)causes the release of chemical neurotransmitter molecules that cause an electrical signal in the next cell

Answer 1

D

Question 2

Vesicles in the axon terminal contain .

A)chromatophilic substance
B)digestive enzymes
C)neurotransmitters
D)Ca²⁺

Answer 2

C

Question 3

The formation of myelin in the peripheral nervous system is accomplished by these cells.

A)oligodendrocytes
B)astrocytes
C)satellite cells
D)Schwann cells

Answer 3

D

Question 4

A nerve _ .

A)consists of entire neurons - dendrites, cell bodies, and axons
B)is found only in the CNS
C)consists of axons wrapped in connective tissue in the PNS

Question 5

These nervous system cells are highly specialized to transmit messages throughout the body.

A)oligodendrocytes
B)astrocytes
C)microglial cells
D)neurons

Question 6

You are examining a neuron under the microscope. It appears as a round cell without visible processes. What is true of this neuron?

A)It is located in the PNS (peripheral nervous system).
B)It is likely to be a unipolar neuron, it is located in the PNS (peripheral nervous system), and it is most likely to be a sensory neuron.
C)It is most likely a sensory neuron.
D)It is likely to be a unipolar neuron.

Question 7

Sensory or afferent neurons are typically of this type.

A)bipolar
B)multipolar
C)unipolar

Question 8

What is true of a mixed nerve?

A)It is found only in the central nervous system.
B)It contains only afferent axons.
C)It contains both afferent and efferent axons.
D)It contains only efferent axons.

Question 9

Interneurons (association neurons)in the brain are likely to be neurons.

A)multipolar
B)unipolar
C)bipolar

Question 10

A demyelinating disease affects .

A)Schwann cells
B)epineurium
C)endoneurium
D)perineurium

Question 11

Groups of axons within a nerve are bound into fascicles by a coarse connective tissue called .

A)epineurium
B)perineurium
C)endoneurium

Question 12

The forms synapses, or junctions, with other neurons or effector cells.

A)initial segment
B)synaptic cleft
C)axon terminal
D)axon hillock

Question 13

Myelin is important in .

A)absorbing damaged tissue or invading organisms
B)insulating axons and increasing the conduction velocity of action potentials
C)maintaining the ionic balance in the environment surrounding the axon
D)allowing electrical signals to be transferred from one axon to another adjacent axon

Question 14

You have lost the sensation, but not movement, in one of your hands due to a problem with your spinal cord neurons. Based upon these symptoms, what type of neuron was most likely affected?

A)afferent neuron
B)motor neuron
C)motor and sensory neurons
D)efferent neuron

Question 15

This type of sensory neuron is quite rare.

A)unipolar
B)multipolar
C)bipolar

Question 16

These support cells are found in the central nervous system.

A)astrocytes and ependymal cells
B)Schwann cells and satellite cells
C)astrocytes and satellite cells
D)oligodendrocytes and Schwann cells

Question 17

What is true about tracts and nerves?

A)Only nerves are myelinated.
B)Tracts are found only in the PNS.
C)Nerves are found in both the CNS and the PNS.
D)Tracts lack connective tissue coverings.

Question 18

This part of the neuron generates and conducts action potentials.

A)cell body
B)axon
C)dendrite

Question 19

The dendrites share this characteristic with the neuron call body.

A)They contain all of the same organelles.
B)They have elaborate membranous channels.
C)They receive synapses from many other neurons.

Question 20

Chromatophilic substance, found within the cell bodies of neurons, is involved in the metabolic activities of the cell and is composed of .

A)lysosomes
B)cytoskeletal elements
C)mitochondria
D)rough endoplasmic reticulum

Question 21

The outermost connective tissue covering of a nerve is called the _.

A)perineurium
B)endoneurium
C)epineurium

Question 22

Functional classification of neurons is based on .

A)the length of the axon
B)the number of processes coming off the cell body.
C)the shape of the neuron
D)whether the signal carried is traveling toward or away from the CNS

Question 23

The gaps in the sheath that insulates axons are called .

A)outer collar of perinuclear cytoplasm
B)gaps of Schwann
C)myelin sheath gaps
D)myelinated fibers

Question 24

Axons give rise to branches called .

A)collaterals
B)axon terminals
C)dendrites
D)initial segments

Question 25

Oligodendrocytes form myelin around .

A)oligodendrocytes do not make myelin
B)only one axon in the peripheral nervous system
C)dozens of axons in both the central and peripheral nervous systems
D)several axons in the central nervous system

Question 26

A cluster of neurons in the peripheral nervous system is called a .

A)fasciculus
B)pod
C)ganglion
D)nucleus

Question 27

A bundle of axons in the CNS is called a .

A)nerve
B)path of white matter
C)tract
D)connective corridor