Nervous impulses are conveyed from the sense organ to the central nervous system via dendrites none of these glial cells both axons and dendrites axons
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- Regeneration of a severed axon has a better chance forsuccess in the PNS than in the CNS. Why is regeneration inthe CNS less likely to succeed?Suppose that a sensory neuron in the periphery generates a trainof action potentials, and synaptically excites an interneuronin the CNS. What does this signal mean? What additionalinformation does the interneuron need in order to decode themessage?Multiple sclerosis is a disease in which theimmune system attacks and destroys the myelin sheath surroundingnerve cells. What effect would you expect the loss of myelin tohave on the speed of nerve impulses?
- What characteristic distinguishes dendrites from axons?a. Presence of branches at the tipsb. Direction of impulse transmission relative to cell bodyc. Whether they direct impulses toward or away from the braind. Presence of sodium channels in the cell membraneAll afferent signals travel what direction? O None of these is correct O Toward a muscle O Toward the CNS O Away from the CNS O Toward a glandWhich Cells insulate axons with Myzrin tn the Cus. in the PUSP
- The giant axon of the squid (Figure Q11–3) occu-pies a unique position in the history of our understandingof cell membrane potentials and nerve action. When anelectrode is stuck into an intact giant axon, the membranepotential registers –70 mV. When the axon, suspended in abath of seawater, is stimulated to conduct a nerve impulse,the membrane potential changes transiently from –70 mVto +40 mV.The central ends of afferents from muscle spindles synapse with all the following types of neurons, except :-a- α-motor neurons of the same muscleb- γ-motor neurons of the same musclec- local interneuronsd- 2nd order neurons of ascending sensory pathwaysахon transmits information away from the cell body (centrifugal) and that ends by the terminal arborization. Only axons are surrounded by a myelin sheath. to the cell body (centripetal) and the axon that PROBI NG Ithe ACTIVITY What are the structural constituents of the gray matter, the white matter, and the nerve? Draw a neuron then use the different documents of the activity to determine, on the figure, t location of each part of the neuron in the nervous system. Using docs a, b, and c, draw and label a transverse section of the spinal cord, a cell body, a transverse section of a nerve.
- Neuroglial cells in the peripheral nervous system composed of myelin that are wound tightly around axons to provide an insulating layer are called Dendrites O Astrocytes O Microglial cells O Schwann cellsWhich is the normal signof the electric charge betweenthe two sides of the neuronplasma membrane? What isthe potential difference(voltage) generated betweenthese two sides? What is thatvoltage called?What is an example of asituation in which the neuroncell body is located in a part ofthe body and its axonalterminal portion is in anotherdistant part of the body? Whydoes this happen?
