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प्रश्न
What is spinal cord? What is its main function?
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उत्तर
The spinal cord is a part of the central nervous system. It is a cylindrical structure enclosed by a bony cage called the vertebral column. It is responsible for spinal reflex actions and the conduction of nerve impulses to and from the brain.
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संबंधित प्रश्न
Which part of the brain maintains posture and equilibrium of the body?
What is meant by receptors and effectors? Give two examples of each.
A person walks across a room in barefeet and puts his foot on a drawing pin lying on the floor. He lets out a cry. Explain what happens in his nervous system in bringing about this response.
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the cells in your nasal passages which perceive the smell?
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sudden application of brakes of the cycle on sighting an obstacle in front
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
Playing on the Keyboard
Mention, if the following statement is True or False
A reflex action is a spontaneous response to a stimulus.
What kind of reflex is cycling?
Categorise the following under stimulus and response.
Pain in the eye if something falls into it.
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
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- Name the parts numbered 1-7.
- Name the phenomenon that the diagram depicts and define it.
- Give the technical term for the point of contact between two nerve cells.
- Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.
