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प्रश्न
Explain the structure of the brain.
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
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.
What are sense organs?
Fill in the blank:
The neurons carrying impulses from the brain to the muscles are called ..........................
Given below is certain structure. Write against them its functional acivity.
Taste bud and …………………..
Define the following:
Action potential
Describe the structure and location of various taste buds.
Complete the following sentence with appropriate word :
Optic nerve is a type Sensory nerve, whereas spinal nerves are __________ nerves
Identify the CORRECT sequence of meninges. (From inside to outside)
All of the following are true for human brain, EXCEPT ______.
How is an electric impulse created in human nervous system?
