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प्रश्न
How does the human nervous system work? Explain.
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उत्तर
When the sense organs such as eyes, ears, nose, tongue or skin are affected in our body, they send message to the brain in the form of electrical impulses through the sensory neurons. The brain analyses this message and decides the action to be taken. The brain, then, sends out instructions to the muscles of the concerned body part through the motor neurons. The concerned body part, then, acts according to the instructions sent by the brain.
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संबंधित प्रश्न
What is the function of the cranium?
What is voluntary nervous system?
Draw a labelled diagram of a neuron.
What does the central nervous system in humans consist of? What is the job of the central nervous system?
Draw a labelled diagram to show the structure of skin.
Define the following:
Neuron
Compare the nervous system and the endocrine system.
what do we refer to in the nervous system when we say:
somatic and autonomic …………………..
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:
Adrenalin and acetylcholine
Draw the following diagram:
Draw a neat labeled diagram of a neuron.
Answer the following question:
What is a reflex action? Explain it with two examples.
Differentiate between:
Afferent and Efferent Nerve.
Give Technical Terms:
The number of cranial and spinal nerves in man.
The brain, the spinal cord and nerves form the nervous system.
The node of Ranvier is found in ______
Identify the labels (i- iii) in the T.S. of the spinal cord.
Complete the following table:
| No. | Name of Nerve | Type of Nerve | Function |
| 1. | Optic | ||
| 2. | Facial | ||
| 3. | Hypoglossal | ||
| 4. | Trigeminal | ||
| 5. | Auditory | ||
| 6. | Glossopharyngeal |
Stimulation of nerves of the sympathetic nervous system ______.
A bundle of axons inside the central nervous system is ______.
