Nervous coordination is highly specialized and involves reacting to simple and complex action and also to internal and external _________ (stimuli / parts) .
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Stimuli is the correct answer
Answer:
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Nervous system
anatomy
WRITTEN BY
Thomas L. Lentz See All Contributors
Professor of Cell Biology, School of Medicine, Yale University, New Haven, Connecticut. Author of Primitive Nervous Systems.
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Nervous system, organized group of cells specialized for the conduction of electrochemical stimuli from sensory receptors through a network to the site at which a response occurs.
neuron; conduction of the action potential
neuron; conduction of the action potential
In a myelinated axon, the myelin sheath prevents the local current (small black arrows) from flowing across the membrane. This forces the current to travel down the nerve fibre to the unmyelinated nodes of Ranvier, which have a high concentration of ion channels. Upon stimulation, these ion channels propagate the action potential (large green arrows) to the next node. Thus, the action potential jumps along the fibre as it is regenerated at each node, a process called saltatory conduction. In an unmyelinated axon, the action potential is propagated along the entire membrane, fading as it diffuses back through the membrane to the original depolarized region.