Which of the following is not a function of the nervous system? |
direct long-term functions, such as growth |
the part of the peripheral nervous system that carries sensory information to the CNS is designated |
Somatic |
The efferent division of the peripheral nervous system innervates __ cells |
all of the answers correct |
The __ nervous system is composed of the brain and spinal cord. |
central |
the __nervous system controls the skeletal muscles. |
somatic |
which of the following is not a recognized structural classification for neurons? |
pseudopolar |
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called |
unipolar |
Neurons that have one axon and one dendrite, with the soma in between, are called |
bipolar |
___ are the most numerous type of neuron in the CNS. |
interneurons |
_____ neurons form the afferent division of the PNS. |
Sensory |
Most CNS neurons lack centrioles. This observation explains |
why CNS neurons cannot divide to regenerate damaged tissue |
How does blocking retrograde axoplasmic transport in an axon affect the activity of a neuron? |
the soma becomes unable to respond to changes in the distal end of the axon |
Neurons that have several dendrites and a single axon are called |
multipolar |
Neurons that are rare, small, and lack features that distinguish dendrites from axons are called |
anaxonic |
The axon is connected to the soma at the |
axon hillock |
The site of intercellular communication between a neuron and another cell is the |
synapse |
Branches that may occur along an axon are called |
collaterals |
Axons terminate in a series of fine extensions known as |
telodendria |
the most abundant class of neuron in the central nervous system is |
multipolar |
___ account for roughly half of the volume of the nervous system |
neuroglia |
The structures labeled "1" are dendrites. Their membranes contain numerous chemically-gated ion channels. |
both statements are true |
the myelin sheath that covers many CNS axons is formed by |
oligodendrocytes |
Small, wandering cells the engulf cell debris and pathogens in the CNS are callled |
microglia |
The neurilemma of axons in the peripheral nervous system is formed by |
Schwann Cells |
Extensive damage to oligodendrocytes in the CNS could result in |
loss of sensation and motor control |
Ion channels that are always open are called ___ channels |
leak |
Anatomy Chapter 12
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