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प्रश्न
Define reflex arc. Give the flow chart of a spinal reflex arc.
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उत्तर
The path travelled by an impulse during a reflex action is called a reflex arc.
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संबंधित प्रश्न
With the help of a neat and labelled diagram, describe reflex arc.
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:
1) Name the phenomenon that is depicted in the diagram. Define the phenomenon.
2) Give the technical term for the point of contact between the two nerve cells.
3) Name the parts numbered 1, 2 and 3.
4) How does the arrangement of neurons in the spinal cord differ from that of the brain?
5) Mention two ways by which the spinal cord is protected in our body.
Name two parts of the body which contain receptors of chemical stimuli.
What are the various sense organs in our body?
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.
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
Which of the following are cerebral reflexes?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person's pupil contracts at once in the presence of bright light
(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
What is a reflex action?
Reflex action is controlled by the
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
State whether the following is
Cleaning
What type of reflex is the following?
Knitting and swimming
Mention, if the following statement is True or False
Reflex action involves brain
Mention, if the following statement is True or False
A reflex action is a spontaneous response to a stimulus.
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
A change in the environment that causes an animal to react is called ______.
Give an example for conditioned reflexes.
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
