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प्रश्न
What is a reflex action?
What is meant by Reflex action?
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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.
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संबंधित प्रश्न
Which of the following is not a natural reflex action?
A. Knee-jerk
B. Blinking of eyes due to strong light
C. Salivation at the sight of food
D. Sneezing when any irritant enters the nose
Name one gustatory receptor and one olfactory receptor present in human beings.
If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?
State one function each of cerebellum and pons.
Which part of the eye contains cells which are sensitive to light?
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?
Give the various functions of brain.
One of the following gives the correct sequence of the components in a reflex arc. This is:
Differentiate between the following pair of terms:
Stimulus and impulse
Define voluntary and reflex actions. Give examples of each.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Contraction of eye pupil
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sudden application of brakes of the cycle on sighting an obstacle in front
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
State whether the following is
Sneezing
State whether the following is
Constriction of pupil
Which one of the following is not a simple reflex?
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
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- Name the parts numbered 1-7.
- Name the phenomenon that the diagram depicts and define it.
- Give the technical term for the point of contact between two nerve cells.
- Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.
