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प्रश्न
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
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उत्तर
Reflex action and its pathway
The pathway taken by nerve impulses to accomplish reflex action is called the reflex arc.
- When the hand is pricked by a needle, the stimulus is the prick (touch) pain, which is sensed by a receptor called touch or pain receptors in the skin in our hand. This stimulus in tum triggers an impulse in a sensory neuron.
- The sensory neuron transmits or conveys the message to the spinal cord.
- The spinal cord interprets the stimulus and the impulse is passed on to the relay neuron, which in tum transmits it to a motor neuron.
- Motor neurons carry commands from the spinal cord to our arms.
- The muscle in our arm contracts and we withdraw our hand immediately from the needle prick. The muscle is the effector organ that has responded to the prick (pain).
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संबंधित प्रश्न
What is spinal cord? What is its main function?
Name the function of cerebrum.
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
State whether the following is simple reflex, conditioned reflex or neither of the two:
Sneezing: …………….
State whether the following is simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
Explain the mechanism of reflex action with the help of a suitable diagram.
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
Which one of the following is not a simple reflex?
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
