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प्रश्न
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उत्तर
- Blinking of the eyelids on exposure to light
- Knee jerk
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संबंधित प्रश्न
With the help of a neat and labelled diagram, describe reflex arc.
Name two parts of the body which contain receptors of chemical stimuli.
Explain the difference between of the following pair of terms :
receptor and effector
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the smell of the food?
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.
With the help of suitable example, describe reflex action.
What type of reflex is the following?
Knitting and swimming
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Give an example for conditioned reflexes.
