Chapter 33 - The Nervous System Flashcards

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1
Q

Central nervous system (CNS)

A

Brain and spinal cord

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2
Q

Peripheral nervous system (PNS)

A

Vast network of nerves - carry messages between body and CNS

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3
Q

Neuron

A

Nerve cell

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4
Q

Sensory neuron (afferent)

A

Takes a message from a sense organ to CNS

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5
Q

Motor neuron (efferent)

A

Takes a message from the CNS to a muscle gland

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6
Q

Ganglion

A

A group of cell bodies located outside the CNS

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7
Q

Interneuron

A

Carries information between sensory and motor neurons

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8
Q

Threshold

A

The minimum stimulus needed to cause an impulse to be carried in a neuron

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9
Q

The ‘all or nothing’ law

A

If the threshold is reached an impulse carried, but if the threshold is not reached no impulse is carried

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10
Q

Refractory period

A

A short time span after a neuron has carried an impulse during which a stimulus fails to cause a response

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11
Q

Synapse

A

A region where two neurons come into close contact

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12
Q

Synaptic cleft

A

The tiny gap between the two neurons at a synapse

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13
Q

Reflex action

A

An automatic, involuntary, unthinking response to a stimulus

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14
Q

Reflex arc

A

The pathway taken by a nerve impulse in a reflex action

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