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प्रश्न
‘A’ is a cylindrical structure that begins from the lower end of the medulla and extends downwards. It is enclosed in bony cage ‘B’ and covered by membranes ‘C’. As many as ‘D’ pairs of nerves arise from the structure ‘A’.
(i) What is A?
(ii) Name (a) bony cage ‘B’ and (b) membranes ‘C’
(iii) How much is D?
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उत्तर
- A is the spinal cord.
- (a) Bony cage is Vertebral column
(c) is Meninges - D is 31 pairs of spinal nerves.
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संबंधित प्रश्न
Differentiate between the following pair of terms:
Receptor and effector.
Name the following:
The third neuron that is involved in reflexes, other than simple reflex.
At the end of repolarization, the nerve membrane gets hyperpolarized. Why?
As compare to medullated nerves, the conduction of impulse by non-medullated nerve fibres is ______ times faster.
In a synapse, the chemical signal is transmitted from ______.
Each branch of the axon terminates as a bulb-like structure called ______
Any factor that can bring a change in the body of an organism is called ______.
Distinguish between the following pair:
Nerve impulse and flow of electricity (transmission and speed)
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
 |
- Write the technical term for the diagram.
- Name two organs of our nervous system where these cells are richly found.
- How are these cells significant for us?
- Name the cell organelle that is absent in these cells and how does it affect our body metabolism?
- Redraw the same figure and label the following Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.
