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प्रश्न
Explain the following term :
Gray matter
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उत्तर
The cerebral cortex contains cell bodies of the neuron and is greyish in colour. It is called gray matter. The grey matter has many folds (i.e. gyri) and grooves (i.e. sulci). They increase the surface area to accommodate more nerve cells. A higher number of convolutions leads to greater intelligence.
संबंधित प्रश्न
Draw the structure of a neuron.
The number of pairs of nerves which arises from the spinal cord is:
The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.
(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?
Draw a labelled diagram to show the structure of skin.
Briefly describe the structure of the cerebrum in the human brain, and mention its functions.
Name the following:
Outermost meningial membrane of spinal cord.
Distinguish between the following pair of words:
Nervous system and hormonal system
Draw the following diagram:
Draw a neat labeled diagram of a neuron.
Short answer question
Rakesh got hurt on his head when he fell down from his motorbike. Which inner membranes must have protected his brain? What other roles do they have to play?
Distinguish between
Sympathetic and parasympathetic nervous system.
