Question

In a particular mammalian species, certain types of neurons have a neuronal radius of 1.5 micrometer. a membrane thickness of 2 micrometer, an axoplasmic resistivity of 1.1 coulomb-m and a membrane reesistivity of 1.6e7 coulomb-m a) compute decay lenght, or physiological range forthis neuron. b) assuming the ranvier nodes are spaced 1mm apart, how many total ranvier nodes, including theoriginal one, will be activated by a voltage spike. only comsider forward direction. c) is this a myelinated or unmylenated neuron? explain

Answer 1

a. modulatory  neurons regulates network output across a physiological  range of modulatory neuron activity.

b. The Nodes of Ranvier are the gaps between the myelin insulation of Schwann cells which insulate axons of neuron. Nodes of Ranvier are microscopic gaps found within myelinated axons. Their function is to speed up propogation of action potentials along the axon via saltatory conduction.

c. this is a myelinated neuron because myelination is highly specialized property of axons and ensures that impulses travel at sufficiently high speed around the autonomic nervous system so that the body can produce a successful response.