Q: Neurons are classified into three major types based on what characteristic?  

Answer: C

Neurons are classified into three major types based on the number of axons and dendrites they possess. These three types are:

1. Multipolar neurons: These neurons have one axon and two or more dendrites arising from the cell body. They are the most common type of neuron and are found in the brain and spinal cord.
2. Bipolar neurons: These neurons have one axon and one dendrite arising from the cell body. They are found in specialized sensory organs such as the retina of the eye and the olfactory epithelium in the nose.
3. Unipolar neurons: These neurons have a single process that emerges from the cell body and divides into two branches. One branch functions as an axon, and the other branch functions as a dendrite. They are found in the sensory ganglia of the peripheral nervous system.

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