Question

Bipolar neurons are present in the
A. Retina of eyes
B. Olfactory epithelium
C. Spinal ganglia at embryonic stage
D. All of the above

Answer 1

Hint: A bipolar neuron, also known as a bipolar cell, is a neuron with two extensions (one axon and one dendrite). Many bipolar cells are sensory neurons with particular functions in the transfer of information. As a result, they are involved in the sensory pathways for smell, sight, taste, hearing, touch, balance, and proprioception, among others. Pseudounipolar neurons start off bipolar in form during embryonic development, but as they grow, they become pseudounipolar

Step by step solution:
Let us see each of the options to find the correct answer.
Option:A - Photoreceptors and horizontal cells (HCs) in the outer retina provide light-elicited signals to amacrine cells (ACs) and ganglion cells (GCs) in the inner retina, which are carried by bipolar cells (BCs).
Option:B – The sensory neurons present in the olfactory epithelium are bipolar neurons where they help in the transduction of olfactory i.e. smell signals.
Option:C – The spinal ganglia at embryonic stage consists of bipolar neurons.
As we have got the option all of the above which seems correct, Option:A, B and C are incorrect.
Option:D – All of the above, since retina of eyes, olfactory epithelium and the spinal ganglia at embryonic stage all contain bipolar neurons.

So, Option:D is the correct answer.

Note:
The number of processes protruding from the cell body can be used to classify neurons. Axons in unipolar neurons are all the same length. An axon and one dendrite stretch from the cell body to opposing poles in bipolar neurons. Multiple dendrites and a single axon characterize multipolar neurons. The neuron is the functional unit of the nervous system. Neurons have one or more dendrites that receive input from other neurons, as well as an axon that synapses with other neurons or non-neural tissues like the muscle.