EVERYDAY SCIENCE

SCIENCE

NERVOUS SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
All neurons have one axon.
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -In some species, axons can emanate from dendrites known as axon-carrying dendrites. No neuron ever has more than one axon; however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other.

Detailed explanation-2: -Every neuron has only a single axon, a thin cylindrical process that can ramify and extend up to 1m. The axon arises from a specialized region of the soma called the axon hillock where an all or none signal (the action potential) is initiated once a critical threshold is reached. The presynaptic terminals.

Detailed explanation-3: -Neurons are polarized cells with two distinct structural compartments: multiple dendrites and a single axon.

Detailed explanation-4: -Some neurons have multiple axons or lack axons all together. Multipolar neurons can be classified on the basis of their dendritic branching pattern and shape of the soma into stellate, pyramidal, fusiform, Purkinje, and glomerular cells.

Detailed explanation-5: -Each multipolar neuron contains one axon and multiple dendrites. Multipolar neurons can be found in the central nervous system (brain and spinal cord). An example of a multipolar neuron is a Purkinje cell in the cerebellum, which has many branching dendrites but only one axon.

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