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प्रश्न
The diagram given below shows the internal structure of the spinal cord, depicting a simple reflex. Study the same and then answer the questions that follow:
(i) Name the parts numbered 1 to 5.
(ii) Using the letters of the alphabet shown in the figure indicate the direction in which an impulse enters and leaves the spinal cord.
(iii) What is the term given to the point of contact between two nerve cells?
(iv) What is meant by ‘simple reflex’ ? Give two examples of simple reflexes and name the stimuli too.
(v) How does the arrangement of nerve cells in the spinal cord differ from that in the brain?
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उत्तर
(i)
1. Sensory or Afferent fiber.
2. The cell body of the sensory neurons.
3. White matter.
4. The cell body of the motor neurons.
5. Spinal nerve.
(ii) BCA
(iii) Synapse.
(iv) Simple reflex: It is an involuntary automatic, quick response to a stimulus.
Examples:
(a) The closing of the eyelids when a strong beam of light is flashed.
(b) The withdrawal of the hand when it is pricked.
(v) In spinal cord white matter is outside and gray matter is inside. In brain white matter is inside and gray matter is outside.
APPEARS IN
संबंधित प्रश्न
Differentiate between following pair with reference to the aspect in bracket.
cerebrum and spinal cord (arrangement of cytons and exons of neurons).
Name the following:
Inability to speak.
Distinguish between the following pair of words:
Cranial nerve and spinal nerve
Where is this located?
Meninges
Give the functions of the spinal cord?
Give Technical Term:
The fluid which fills the central canal of the spinal cord.
Complete the following sentence with appropriate word :
The part of the central nervous system which responds to the reflex action is ________.
Mention, if the following statement is True or False
Spinal nerves are twelve pair
Describe the structure of the spinal cord.
Explain the formation of a typical spinal nerve with the help of a neat labelled diagram.
