Multiple sclerosis causes demyelination of axons in the brain and spinal cord. True or False
Added by Benjamin A.
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Step 1: Understand the term "multiple sclerosis" Multiple sclerosis (MS) is a chronic autoimmune disorder that affects the central nervous system (CNS), which includes the brain and spinal cord. Show more…
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Multiple sclerosis causes demyelination of axons in the brain and spinal cord. Why is this problematic?
People with multiple sclerosis (MS) experience many challenging symptoms. Which statement best explains one cause of these difficulties? Loss of oligodendrocytes in the central nervous system results in absence of the myelin sheath of neuronal axons, impairing rapid saltatory conduction. An increase in the number of oligodendrocytes in the central nervous system results in an overgrowth of the myelin sheath of neuronal axons, resulting in abnormally large action potentials. Damage to ependymal cells results in stagnation of cerebrospinal fluid, damaging neurons. A loss of astrocytes causes leaked neurotransmitters and K+ to accumulate, impairing generation of action potentials.
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Multiple sclerosis (MS) is a disorder where the body's immune system attacks and destroys the myelin surrounding nerves. The consequences of this are that: A) the cell bodies of nerve cells cannot be stimulated because sodium receptors are not functioning properly. B) The axons of the neurons are less effective in relaying messages because their insulating sheaths have been damaged. C) Neurotransmitter molecules in terminal knobs are broken down and cannot relay an impulse to the next neuron. D) Receptor sites on the post-synaptic membrane have been damaged and can no longer be stimulated sufficiently to initiate an action potential in the next neuron.
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