Describe the difference between myelinated and unmyelinated nerve fibers (Be Specific). Why is the speed of signal conduction faster in myelinated fibers?
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Describe the difference between myelinated and unmyelinated nerve fibers (Be Specific). Why is the speed of signal conduction faster in myelinated fibers?
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- Distinguish between insulation by oligodendrocyte or Schwann cells. Relate myelination to signal speed. Describe the myelin-related terms: neurilemma, nodes of Ranvier, internodes, nonmyelinatedIn Neurology, please explain the relationship between suprathreshold depolarization and induced electrical neuro transmission. Is suprathreshold depolarization essential for inducing the electrical transmission?please explain in a few sentences.View an electron micrograph of a cross-section of a myelinated nerve fiber image below. The axon contains microtubules and neurofilaments, bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain that makes them the deep, dark, black color, such as the multiple layers that are the myelin sheath?
- Because the long axons of neurons look like electrical wires, and both neurons and electrical wires conduct electricity, it is tempting to equate the two. Compare and contrast the functioning of axons and electrical wires in terms of their structure and the nature of the electrical signals they conduct. Please include references.Assume that two nerves fibers have the same diameter, but one is myelinated and the other is unmyelinated. The conduction of an action potential is most energy-efficient along which type of fiber?Describe how action potentials are conducted by unmyelinated nerve fibers. Why is saltatory conduction in myelinated fibers more rapid?
- Read the following statements (a) The resting nerve membrane is freely permeable to Na*, K* ions and negatively charged proteins. (b) The activity of Na* - K* pump is responsible for maintaining resting membrane potential. (c) The resting membrane is impermeable to negatively charged proteins present in the axoplasm. Choose the option representing correct statements. b only a and b b and c a, b and cView the University of Michigan WebScope (http://openstaxcollege.org/l/nervefiber) to see an electron micrograph of a cross-section of a myelinated nerve fiber. The axon contains microtubules and neurofilaments that are bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain to make them a deep, dark, black color, such as the multiple layers that are the myelin sheath?Identify and label the following structures on the neuron model figure below: cell body, dendrites, neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath, axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer to Figure 10.6). 3) 11
- Discuss the concept of myelination and the purpose of the myelin sheathDescribe the resting potential for neurons. How is this potential established? Describe the development of the action potential. How does this come about, and what is the function of this phenomenon? Include a diagram of the various stages of the action potential, showing the changes in voltage that occur throughout this phenomenonDraw a typical action potential (correctly label axis) and explain in words the roles of ion channels in generating the different phases of the action potential. (Extra credit: How would opening voltage gated calcium channels upon depolarization affect the shape of the action potential if they have a relatively slow inactivation rate?)