Science, asked by sunwaranita, 3 months ago

Decide whether the following statements are true or false (any five)
2.7 Node of Ranvier is formed due to discentinuation of neurilemma in nerve cell.
2.8 Spindle fibres are formed from astral rays during animal cell division.
2.9 Homozygote is produced from the union of (T and gametes.
.10 Ammonia, Hydrogen and Methane were used in the experiment on the bio-chemical origin of life by
Miller and Urey.

Answers

Answered by santoshchaurasiya254

Which of the following statement is correct for node of Ranvier of neuron?

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ANSWER

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Myelin sheath is discontinuous because of the presence of nodes of Ranvier. Nodes of Ranvier, the periodic gap in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses. However, nodes of Ranvier interrupt the insulation at intervals, and this discontinuity enables impulses to jump from node to node in a process known as saltatory conduction. Whereas neurolemma is the outermost nucleated cytoplasmic layer of Schwann cells (also called neurolemmocytes) that surrounds the axon of the neuron. Thus, the correct answer is option B.

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