18 Questions
What is the main difference between myelinated and unmyelinated nerve fibers in terms of nerve impulse conduction?
Myelinated fibers conduct nerve impulses faster than unmyelinated fibers.
What term is used to describe the conduction of nerve impulses where they jump from one node of Ranvier to another in myelinated nerve fibers?
Saltatory conduction
What factor determines the effectiveness of a stimulus on a nerve fiber?
Intensity of the stimulus
What is the term used for the minimal intensity of a stimulus that produces a nerve impulse in a nerve fiber?
Threshold stimulus
What law does a single nerve fiber obey in response to stimuli?
All or None Law
What characterizes the mixed nerve that consists of many nerve fibers?
Different diameters and excitability
Which type of nerve fibers are most susceptible to local anesthetic drugs?
Group C
What type of potential change occurs when using cathodal currents for nerve stimulation?
Partial depolarization
Which group of nerve fibers is most sensitive to pressure?
Alpha (α)
What effect does hyperpolarization have on the excitability of a nerve?
Decreases excitability
Which type of nerve fibers have the highest speeds of conduction?
Group A
What leads to an increase in both K+ efflux & Cl- influx in a nerve membrane?
-ve charges at the outer surface
What is the mechanism of nerve impulse conduction in unmyelinated nerve fibers?
Local current flow between the depolarized area and surrounding areas
Which type of neuron carries orders from the CNS to organs?
Motor (Efferent) neuron
What is the role of myelination in nerve impulse conduction?
Increases the speed of propagation
Which type of neuron is a postganglionic neuron?
Non-myelinated nerve fiber neuron
What happens during repolarization in nerve impulse conduction?
Partial depolarization of surrounding sites
How does the speed of propagation relate to the diameter of the nerve fiber?
Speed is directly proportional to diameter
Learn about the types of neurons based on their processes, functions, and myelination. Explore the characteristics of unipolar, bipolar, and multipolar neurons, as well as their roles in sensory and motor functions.
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