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प्रश्न
What is a reflex action? Explain with the help of an example.
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उत्तर
Reflex action is a rapid and automatic response to a stimulus. It is not under the voluntary control of the brain. For example, if we unknowingly touch a hot plate, we immediately move our hand away from it.
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संबंधित प्रश्न
Give three examples of reflex actions.
What is meant by receptors and effectors? Give two examples of each.
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?
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?
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the gland which is stimulated to secrete saliva.
The involuntary actions in the body are controlled by :
(a) medulla in forebrain
(b)medulla in hindbrain
(c) medulla in spinal cord
(d) medulla in midbrain
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
(a) Name the structure P.
(b) Name (i) bony cage Q, and (ii) membranes R.
(c) How much is x?
(d) Name the organs S.
(e) What are the reflexes involving structure P only known as?
Differentiate between the following pair of terms:
Stimulus and impulse
what do we refer to in the nervous system when we say:
Natural and conditioned …………………
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
State whether the following is
Playing on the Keyboard
What type of reflex is the following?
Solving mathematical sums
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
Mention, if the following statement is True or False
Reflex action involves brain
Complete the following sentence with appropriate Word
A reflex arc in man is best described as movement of stimuli from:
Differentiate between Voluntary and involuntary actions.
What kind of reflex is cycling?
Why have reflex arcs evolved in animals?
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
