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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
Draw the structure of a neuron.
Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.
Which parts of the body form the central nervous system?
The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.
Give the functions of retina, pupil, and optic nerve.
Given below is a certain structure. Write against them its functional activity.
Olfactory nerve and ______.
Give Reason:
Why injury to medulla oblongata results in death?
The human nervous system is divided into ______ parts.
Specific gravity of CSF is ______.
Eight pairs of spinal nerves originate from ______ part of vertebral column.
