PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have huge appetites.
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They are the longest cells in the human body.
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They do the heavy lifting for the nervous system.
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They are replaceable.
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Detailed explanation-1: -They do not divide at all. There are very few exceptions to this rule – only two special places in the brain can give birth to new neurons. For the most part though, the brain cannot replenish dead neurons. This is especially worrisome because neurons are very sensitive cells and they die for all sorts of reasons.
Detailed explanation-2: -Neurons produced in adulthood replace other neurons of the same class that have died. The evidence for numerical replacement and for specificity of replacement is as follows.
Detailed explanation-3: -Answer and Explanation: The correct answer is (d): all of the above. Neurons are excitable cells that have a cell body known as soma, and two different types of extensions called dendrites and axons. The soma contains the nucleus and most of the organelles.