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प्रश्न
What is the role of the brain in reflex action?
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उत्तर
Reflex actions are sudden responses, which do not involve any thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking as thinking may take time which would be enough to get us burnt. The sensory nerves that detect heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is called a reflex arc. The reflex arcs − connections present between the input and output nerves − meet in a bundle in the spinal cord.
Reflex arcs are formed in the spinal cord and the information (input) reaches the brain. The brain is only aware of the signal and the response that has taken place. However, the brain has no role to play in the creation of the response.
संबंधित प्रश्न
With the help of a neat and labelled diagram, describe reflex arc.
Give examples of unconditional reflexes
Name one gustatory receptor and one olfactory receptor present in human beings.
Explain the difference between of the following pair of terms :
receptor and effector
Explain the difference between of the following pair of terms :
cerebrum and cerebellum
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.
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Give one example of a conditioned reflex in your own life.
Reflex action is controlled by the
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is
Cleaning
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
If after cutting through dorsal root of a spinal nerve of a mammal, the associated receptor in skin was stimulated the animal would ______.
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
