Neurons are amitotic, which means that after a certain stage, they do not divide
ID: 93306 • Letter: N
Question
Neurons are amitotic, which means that after a certain stage, they do not divide further. Most tumor cells are characterized by a rapid rate of mitosis. Considering this, of which cell types (neurons or neuroglia) must brain tumors be composed? Why? A traumatic brain injury number of damaged or dying neurons. In such a case, which neuroglial cell would you expect to Explain. Multiple sclerosis is a demyelinating disease, in which the patient's immune system attacks and destroys the cells that form the myelin sheath in the central nervous system. What types of symptoms would you expect from such a disease? Why? Would Schwann cells or oligodendrocytes be affected? Local anesthetic drugs such as lidocaine block sodium ion channels in the neuron plasma membrane from opening. What effect would this have on action potential generation and conduction?Explanation / Answer
1) Over growth of cells forms tumors.Nueronal tumor is caused by overgrowth of neurons or neuroglia.These neurons are abnormal.Neuronal tumor is a rare type.These tumor grow quite slow,which while observed looks almost normal.These tumors can occur in any people of any age group.2) Insufficient data 3) Symptoms: a. Fatigue
b.nerve pain
c.bladder problems
d.loss of vision
e.numbness
f.dizziness
Inflammatory demyelination happens when the immune system attacks myelin.It occurs in the white matter of the brainand in the spinal cord.Multiple sclerosis affects oligodendrocytes because they are present in central nervous system.
4) lidocaine is an local anaesthetic drug.This drug blocks the sodium(Na+) channels in the neuronal cell membrane.These are responsible for signal propagation.With the blockage of ions postsynaptic neurones will not depolarize and fail to transmit an action potential.The anaesthetic effect prevents the pain signal from the brain.