1) The myelination of neurons in the PNS is done by: a. astrocytes b. oligodendr
ID: 3509523 • Letter: 1
Question
1) The myelination of neurons in the PNS is done by:
a. astrocytes
b. oligodendrocytes
c. Schwann cell or neurolemmocyte
d. pyramidal cells
e. Purkinje cells
2) Neurons in the CNS fail to re-grow because of inhibition of growth by the?
a. oligodendrocytes
b. Schwann cells or neurolemmocytes
c. axons
d. cell bodies
e. astrocytes
3) Which division of the nervous system communicates with the gastrointestinal tract, particularly the smooth muscles and glands?
a. Somatic
b. intestinal
c. enteric
d. autonomic
4) What type of neural circuit involves a small number of presynaptic neurons influencing a large number of postsynaptic neurons?
a. divergent circuit
b. convergent circuit
c. reverberating circuit
d. none of these choices
5) A main difference between neurons (nerve cells) and neuroglia (glia) is:
a. neuroglia are found only in the central nervous system.
b. mature neurons do not normally divide; neuroglia do.
c. neurons are more numerous than neuroglia.
d. neurons are generally smaller than neuroglia.
Explanation / Answer
1) the myelination in PNS is done by Schwan cells while in CNS it is done by oilgodendrocytes.
2) C option that is Axon , CNC re-growth is limited by the axon growth because in injured or CNC lession surrounding oligodendrites and asterocytes produce inhibitory molecules which inhibits axon growth and thus CNS regrowth.
3) Enteric is the right answer because it Its sensory neurons monitor tension in the intestinal wall and assess the composition of intestinal contents. Enteric nervous system is the paert of PNS
4) Divergent circuit
5) b option is correct that is neurons generally do not devide while neuroglia do to maintain the homeostatis of the brain and continous production of mylein to protect the neurons.
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