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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
What happens at the synapse between two neurons?
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.
Mention the three functions of the spinal cord.
Name the following:
The biological term given to the protective membranes of the brain.
Name the following:
Cavity in which brain is situated.
Draw the following diagram:
Draw a neat labeled diagram of a neuron.
Differentiate between:
Cerebrum and Cerebellum.
Choose the Odd One Out:
The nervous system consists of bones, cartilages, and joints.
Trace the sequence of events which occur when you suddenly touch a hot object.
