Advertisements
Advertisements
प्रश्न
What is a reflex action?
What is meant by Reflex action?
Advertisements
उत्तर १
Reflex action is a sudden, spontaneous, automatic, involuntary response to a stimulus.
उत्तर २
Reflex action is an autonomic, quick and involuntary action in the body brought about by a stimulus.
APPEARS IN
संबंधित प्रश्न
How do we detect the smell of an incense stick (agarbatti)?
If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?
Name two parts of the body which contain receptors of chemical stimuli.
Give three examples of reflex actions.
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 gustatory receptors of our body are in one of the following organs. This organ is :
a) ear
(b) nose
(c) tongue
(d) skin
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.
Differentiate between the following pair of terms:
Stimulus and impulse
With the help of suitable example, describe reflex action.
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
Explain the mechanism of reflex action with the help of a suitable diagram.
Give one example of a conditioned reflex in your own life.
Explain the following term :
Conditioned reflex
State whether the following is
Sneezing
State whether the following is
Salivation when food is put in the mouth.
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?
Which of the following is an example of unconditioned reflex?
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.
Seeing a green light turning into red at a road crossing before applying the brakes.
