Question

Consider the following statements. Which of them are true?

1. There are three main parts in a neuron - a cell body, an axon and dendrites.

2. The cytoplasm is thick here and contains granular substances called Nissl's bodies.

3. Branched processes termed dendrites arise from the cell body of a neuron.

4. All neurons have only one axon.

• A. 1, 2 & 4
• B. 1, 2 & 3
• C. 2, 3 & 4
• D. All

Answer 1

Answer: (B)

Statement 4 is incorrect.

Multipolar neurons. for example have two axons arising from a cell body.
Based on the divisions or bifurcations, neurons are grouped into three types:
Unipolar: Single process with one cyton and one axon. eg: Spinal cord.
Bipolar: Two processes with one cyton and one axon. eg: Retina, ear.
Multipolar: Single process with one cyton and many axons. eg: Muscles