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प्रश्न
Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
विकल्प
(i) and (ii)
(i) and (iii)
(i) and (iv)
(i), (ii) and (iii)
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उत्तर
(i) and (iv)
Explanation:
Statements (i) and (iv) are correct, while statements (ii) and (iii) are not. Sensory neurons carry signals from the receptors to the brain or the spinal cord, while motor neurons carry signals from the brain or the spinal cord to the effector organs like muscles and glands.
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संबंधित प्रश्न
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
A person walks across a room in barefeet and puts his foot on a drawing pin lying on the floor. He lets out a cry. Explain what happens in his nervous system in bringing about this response.
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
Define reflex arc. Give the flow chart of a spinal reflex arc.
All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
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.
List in tabular form two differences between reflex action and walking.
List in tabular form three distinguishing features between cerebrum and cerebellum.
What is a reflex action?
Give one example of a conditioned reflex in your own life.
Explain the following term :
Conditioned reflex
Mention, if the following statement is True or False
Reflex action involves brain
A change in the environment that causes an animal to react is called ______.
Why have reflex arcs evolved in animals?
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
