Question

Given below is a type of neuron and is found in

A)Retina
B)Hydra
C)Cerebral cortex
D)Embryonic stage

Answer 1

Hint: Neuron is a cell that can be excited electrically and can also transmit this excitation to other cells by means of specialized connections known as synapses. Neurons are present in all animals with two exceptions, sponges and placozoa and absent in plants and fungi.

Complete answer:
Neurons comprise three components- a cell body, dendrites and an axon. The axon and dendrites are filamentous whereas the cell body is compact. Neurons receive signals through the dendrites and pass this signal to the cell body and further down to the axon. Axons extend from the cell body towards the terminal portion of the neuron known as the axon terminal. Signals from the axon terminal are passed to the surrounding neuron by means of synapse.

The signalling is partly electrical and partly chemical. Neurons comprise of voltage gated channels across their membrane, on receiving a signal the voltage changes by a large amount in a small period of time resulting in generation of action potential. The action potentials are then transmitted across the axon and reach the neighbouring neuron. The initial signal may either be excitatory or inhibitory. Neurons may be unipolar, bipolar or multipolar, the given neuron in the question is multipolar as it possesses a single axon and many dendrites. Multipolar neurons are found mostly in the cerebral cortex.

Hence, the correct answer is option (C)

Note: Neurons are classified into three major types on the basis of their function- sensory neurons, motor neurons and interneurons. Sensory neurons respond to stimuli that affect the sensory organs, motor neurons receive signals from brain and spinal cord and transmits to the rest of the body and interneurons connect two or more neurons within the same region.