A student says: 'Neuroglia are only the glue of the nervous system, and they are very few.' What is…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student says: 'Neuroglia are only the glue of the nervous system, and they are very few.'
- What is the work of the neuroglia, according to NCERT?
- What share of the volume of neural tissue do they make up?
- Name the neuroglia that make myelin in the nerves of the body.
- Do neuroglia carry nerve impulses like neurons?
Need a reminder? The key ideaShow
Neural tissue controls the responses of the body. The neuron is the unit of the nervous system. A neuron has a cell body (cyton) with the nucleus and Nissl granules, dendrites that bring impulses to the cell body, and an axon that carries impulses away. The axon ends in axon terminals. A myelinated axon has a myelin sheath with gaps called nodes of Ranvier. The impulse jumps from node to node, so a myelinated fibre conducts faster than an unmyelinated one. Neuroglia support and protect neurons and make up more than half the volume of neural tissue. The time taken by an impulse is the distance divided by the speed.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) They protect and support the neurons.
Step 2. (b) More than one half of the volume of neural tissue. They are not few.
Step 3. (c) The Schwann cells.
Step 4. (d) No. Neurons are the excitable cells that conduct impulses.
Answer: (a) protect and support neurons; (b) more than half; (c) Schwann cells; (d) no.
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