HISTOLOGY
NERVOUS TISSUE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Explanation: Nissl granules are absent in Axon. The neuron is made up of a cell body (cyton), dendrites (dendron), axons and axon terminals.
Detailed explanation-2: -The axon hillock contains a very high concentration of voltage-gated Na+ channels that become activated once a critical membrane potential is reached, the threshold potential. The threshold potential is a membrane depolarization of approximately 10 mV from rest.
Detailed explanation-3: -Nissl’s granules are fragments of rough endoplasmic reticulum (RER). They are involved in protein synthesis and are found only in specific parts of the neuron; in the cyton as well as the dendrites. They are absent in axon.
Detailed explanation-4: -Axons do not contain Nissl’s granules.