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Which of the following statement is correct about the node of Ranvier?
Which of the following statement is correct about the node of Ranvier?
Updated On: Aug 1, 2022
- Axolemm is discontinuous
- Myelin sheath is discontinuous
- Both neurilemma and myelin sheath are discontinuous
- Covered by myelin sheath
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The Correct Option is B
Solution and Explanation
Neurons are the chief functional units of the nervous system. An ordinary neuron has a soma or cyton and a long thread, called axon which is enclosed in a multilayered myelin sheath, made by Schwann cells. The myelin sheath is interrupted at the spaces between Schwann cells to form gaps. These gaps are called nodes of Ranvier. These nodes and the myelin sheath created condition that speed up the nerve impulses.
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Concepts Used:
Human Nervous System
The human nervous system is responsible for controlling and coordinating all the activities of the human body.
The three major functions of the human nervous system are:
- Gathering or assembling sensory information from the body and external environment.
- Processing and interpreting the sensory information acquired.
- Conveying or transferring appropriate response to the sensory information acquired.
The nervous system is mainly divided into two, namely:
The Central Nervous System (CNS) comprises the brain and spinal cord.
- The brain is majorly involved in the perception and processing of sensory input. It also regulates or manages voluntary motor responses and homeostatic mechanisms.
- The spinal cord act as a pathway for the transmission of information between the brain and the peripheral nervous system. It also takes action on reflex actions.
The Peripheral Nervous System (PNS) comprises sensory/motor neurons and ganglion.
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