Multiple Choice
Which term refers to an event that activates a neuron and begins an action potential?
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45. Nervous System
Neurons and Action Potentials
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Which criterion is used to functionally classify neurons?
A
The presence or absence of myelin sheath
B
The length of their axon
C
The number of dendrites they possess
D
The direction in which they transmit nerve impulses
Verified step by step guidance1
Understand that neurons can be classified based on their function, which is determined by the direction in which they transmit nerve impulses.
Learn the three functional classifications of neurons: sensory neurons (afferent neurons), motor neurons (efferent neurons), and interneurons.
Sensory neurons transmit impulses from sensory receptors toward the central nervous system (CNS). Motor neurons transmit impulses from the CNS to effectors like muscles or glands. Interneurons connect sensory and motor neurons within the CNS.
Recognize that other criteria, such as the presence of a myelin sheath, axon length, or the number of dendrites, are structural classifications rather than functional classifications.
Conclude that the correct criterion for functional classification of neurons is the direction in which they transmit nerve impulses.
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