Neural Control and Coordination — BIOLOGY STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYNeural Control and Coordination3 Marks
Question
Give a description of the structure of neuron.
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Answer
A neuron is a microscopic structure composed of three major parts, namely, cell body, dendrites and axon Cell Body. The cell body contains cytoplasm with typical cell organelles and certain granular bodies called Nissi's granules.
Dendrites: Short fibres which branch repeatedly and project out of the cell body also contain Nissi's granules and are called dendrites. These fibres transmit impulses towards the cell body.
Axon: The axon is a long fibre, the distal end of which is branched. Each branch terminates as a bulb-like structure called synaptic knob which possess synaptic vesicles containing chemicals called neurotransmitters. The axons transmit nerve impulses away from the cell body to a synapse or to a neuro-muscular junction.
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