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प्रश्न
Explain the structure of the brain.
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उत्तर
The brain is the main control centre of the nervous system.
It is enclosed within the bony shell of the cranium.
It consists of three main part:
- Cerebrum: It is the uppermost and largest part with many ridges and grooves. It is divided into right and left halves called cerebral hemispheres. It controls our thinking, reasoning, intelligence, memory, and perception of pain, sound, touch, taste, and smell.
- Cerebellum: It is located under the cerebrum at the back of the head. It maintains the balance of the body and coordinates muscular activity.
- Brain stem (medulla oblongata): It joins the brain to the spinal cord. It controls the activity of internal organs like heartbeat and breathing.
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संबंधित प्रश्न
Draw a labelled diagram of a neuron.
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
With the help of a suitable diagram describe the structure of a neuron.
Fill in the blank:
Central nervous system consists of ................. and ................
Complete the following table by filling in the blank spaces.
| Structure | Function |
| Yellow Spot | |
| Transfers impulse from inner ear to brain | |
| Helps to change the focal length of the eye lens | |
| Spinal cord | |
| Oval window | |
| Dynamic equilibrium |
Complete the following sentence with appropriate word :
There are _______ neurons in our body.
What are masses of grey matter located in white matter in the cerebral hemisphere?
Which of the following is the correct description of Gyri and sulci?
How is an electric impulse created in human nervous system?
What is arbour vitae?
