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Nervous System

What is a stimulus?
Changes detected inside or outside the body
Wrong
What is sensory input?
Information gathered by receptors
Wrong
What does integration mean?
Sensory input is processed and interpreted
Wrong
When the nervous system dictates a response by activating the effector organs this is called:
Motor output
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The CNS is composed of the _ and the _
Brain and spinal cord
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The PNS consists of what two kinds of nerves?
Cranial and spinal
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Ganglia are clusters of:
Neuronal cell bodies
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Afferent is the sending of impulses _ the CNS
Towards
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Efferent is sending impulses _ _ the CNS
Away from
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Sensory is to _ as _ is to efferent
Afferent, motor
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What is a good acronym to help you remember this?
SAME. Sensory is to afferent as motor is to efferent
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What are the 3 basic divisions of the NS?
Somatic sensory, somatic motor, visceral sensory, visceral motor
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Which one is the autonomic nervous system?
Visceral
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Neurons transmit:
Electrical signals
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Support cells are non-:
Excitable
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Neurons are the basic _ _ of the NS
Structural unit
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What are the 3 special characteristics about neurons?
Longevity, do not divide, high metabolic rate
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Without oxygen neurons die after:
5 minutes
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Dendrites function as receptive sites for:
Receiving signals from other neurons
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What is the axon?
Impulse generator and conductor- it transmits impulses away from the cell body
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Where are neurotransmitters released?
At the terminal boutons
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What is the site at which neurons communicate?
The synapses
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What is axodendritic?
A synapse between axon terminals of one neuron and dendrites of the other
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What is axosomatic?
A synapse between axons and neuronal cell bodies
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Numerous dendrites and one axon =
Multipolar neurons
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Two dendrites and one axon =
Bipolar neurons
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One (or zero) dendrites per axon =
Unipolar neurons
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Sensory neurons transmit impulses _ the CNS
Towards
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_ _ transmit impulses away from the CNS
Motor neurons
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Interneurons are between _ and _ _ and are confined to the _
Motor and sensory neurons and are confined to the CNS
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Nerves of the CNS are composed of:
Interneurons
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What are reflex arcs?
Simple chains of neurons responsible for reflexes
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What reflex has just one synapse?
Monosynaptic reflex
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What is an example of a polysynaptic reflex?
Withdrawal reflex (taking your hand away from something hot)
Wrong
Neurons pass a signal to a specific destination along a single pathway... What is this type of processing?
Serial processing
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Input is delivered along many pathways; a single stimulus results in multiple perceptions... What is this type of processing?
Parallel processing
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What is multiple sclerosis?
An autoimmune disease
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What happens when you have an autoimmune disease?
Immune system attacks the myelin around axons in the CNS
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