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प्रश्न
Explain the following term :
Gray matter
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उत्तर
The cerebral cortex contains cell bodies of the neuron and is greyish in colour. It is called gray matter. The grey matter has many folds (i.e. gyri) and grooves (i.e. sulci). They increase the surface area to accommodate more nerve cells. A higher number of convolutions leads to greater intelligence.
संबंधित प्रश्न
How does the human nervous system work? Explain.
In a synapse, chemical signal is transmitted from :
(a) axon to cell body of the same neuron
(b) cell body to axon end of the same neuron
(c) dendrite end of one neuron to axon end of adjacent neuron
(d) axon end of one neuron to dendrite end of adjacent neuron
Mention the three functions of the spinal cord.
Name the following:
The biological term given to the protective membranes of the brain.
Match the terms of column I with those of column ll
| Column l | Column ll |
| (i) Lens | (a) Adjustment of light rays |
| (ii) Lachrymal gland | (b) Vision |
| (iii) Olfactory epithelium | (c) Secretion of tear |
| (iv) Cochlea | (d) Balance of the body |
| (v) Semicircular canal | (e) Hearing |
| (vi) Eyes | (f) Smell |
Distinguish between the following pair of words:
Nervous system and hormonal system
Draw a well-labeled diagram of a Neuron.
Draw the following diagram:
Draw a neat labeled diagram of a neuron.
Identify the lobe which has centre for visual functions.
A deep longitudinal fissure divides the telencephalon into ______.
