Final answer:
Neurons are classified into four types, one of which is bipolar neurons. These neurons have a dendrite at one end and an axon at the other, and can be found in the retina of the eye.
Step-by-step explanation:
Neurons are the cells responsible for transmitting electrical signals in the nervous system. They are classified into four main types based on the number and placement of their axons: unipolar, bipolar, multipolar, and pseudounipolar. Bipolar neurons are spindle-shaped neurons with a dendrite at one end and an axon at the other. They can be found in the light-sensitive retina of the eye.