Anatomy Chapter 12

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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

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