10 Questions
Where do membrane polarization, depolarization, and repolarization occur in the myelinated nerve fiber?
Only at the nodes of Ranvier
What is the gap between the terminal button of one neuron and the cell membrane of another neuron called?
Synaptic cleft
What is the ability of a nerve to respond to stimuli known as?
Excitability
What is the minimal stimulus that can produce a propagated nerve impulse in a nerve fiber called?
Threshold stimulus
During which phase of the action potential does the membrane polarity rapidly reverse, making the inner surface positive to the outer surface?
Depolarization
What is the main role of the myelin sheath around the nerve fiber?
To act as a chemical and electrical insulator
Which component of a nervous cell conducts nerve impulses away from the cell body?
The axon
What is the main function of dendrites in a neuron?
To conduct nerve impulses to the cell body
What is the structure that forms the myelin sheath around the nerve fiber?
Schwann cell
In the peripheral nerves, what type of nerve fibers do dendrites make?
Afferent sensory nerve fibers
Test your understanding of the functional structure of nerve cells, the role of the myelin sheath, conduction of impulses, electrical changes due to a stimulus, and excitability changes. Explore the components of the nervous system, including the central nervous system (CNS) and peripheral nerves.
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