16) The myelin sheaths A) astrocytes. B) Schwann cells. C) oligodendrocytes. D)

Question

16) The myelin sheaths A) astrocytes. B) Schwann cells. C) oligodendrocytes. D) microglia. E) ependymal cells. that surround the axons of some of the neurons in the CNS are formed by 17) Small phagocytic cells that are especially obvious in damaged tissue in the CNS are the A) astrocytes. B) Schwann cells. C) oligodendrocytes. D) microglia. E) ependymal cells. 18) Cells responsible for information processing and transfer are A) neuroglia. B) Schwann cells. C) neurons. D) astrocytes. E) microglia. 19) Interneurons A) are found only in the central nervous system. B) carry only sensory impulses. C) carry only motor impulses. D) only connect motor neurons to other motor neurons. E) are found between neurons and their effectors. 20) Most neurons lack centrioles. This observation explains A) why neurons grow such long axons. B) why these neurons cannot regenerate. C) the conducting ability of neurons. D) the ability of neurons to communicate with each other. E) the ability of neurons to live long lives. 21) Opening of sodium channels in the membrane of a neuron results in A) depolarization. B) repolarization. C) hyperpolarization. D) increased negative charge inside the membrane. E) none of the above

Explanation / Answer

16) c) oligodendrocytes are the cells from which myelin membrane originate and is part of it in CNS and in PNS the Schwinn cells are the one from which the mylein sheath originate.

17) d) Microglia. These act as phagocytes in CNS and clear the cellular debris and dead neurons.

18) c) neurons. These are specialized cell transmit nerve impulses by which it process and transfer the information.

19) a) interneurons are found only in the CNS. they are found in the spinal cord of CNS .they relay signals between sensory neurons and motor neurons.

20) b) why these neurons cannot regenerate . Because centrioles are involved in development of spindle fibers in cell division.

21) a) depolarization. Because opening of sodium channels lead less negative inside the cell and shift in electric charge distribution occur.

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