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प्रश्न
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उत्तर
Reflex action - It is an immediate and involuntary response to a stimulus.
Example - 1. Blinking of eyelids on exposure to light .
2. Knee jerk.
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संबंधित प्रश्न
What is a reflex action? Explain with the help of an example.
Give the various functions of brain.
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Define the following:
Reflex action
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Give an example for conditioned reflexes.
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
Categorise the following under stimulus and response.
Pain in the eye if something falls into it.
