What is the difference in function between CNS gray matter and CNS white matter? Where are these tissues located in the brain and spinal cord? What structure is found surrounding axons in both the CNS and the PNS? a. myelin sheath b. neurilemma c. Nodes of Ranvier d. plasma membrane e...
Which of the following is not a principal component of neurons? (a) Axon (b) Neuroglia (c) Cell body (d) Dendrite (e) Node of Ranvier. What is the name of the nervous tissue where the presynaptic parasympathetic nerves that serve ...
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Looking for online definition of RANWC or what RANWC stands for? RANWC is listed in the World's most authoritative dictionary of abbreviations and acronyms
Nodes of Ranvier are actually constrictions in the layers of the Schwann cell surrounding the axon. At the nodes of Ranvier, the myelin sheath is completely absent and the axon is often only covered by a very thin membrane. Instead of a nerve impulse traveling through the length of the axon...
The evolution of the myelin sheath and nodes of Ranvier in vertebrates has made the transmission of nerve impulses quicker and that much more efficient. In the absence of myelin, the entire axon would undergo the depolarization process and have the action potential pass through it. The insulation...
is useful on those occasions when unwanted insect visitors settle on the skin. Merkel cells are also in themechanoreceptorsgroup; these receptors adapt much slower than Pacinian corpuscles. When holding a coin in the palm of the hand, the Merkel cells will signal that it is still there after...
When a neuron fires an action potential, it causes neurotransmitter release onto a post-synaptic neuron. If excitatory, this neurotransmitter will depolarize the post-synaptic cell, and may cause this cell to fire an action potential. Often, one input will not be enough; neurons typic...