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प्रश्न
Write down the following activities in the correct order for a simple reflex arc:
(a) impulse travels in the motor fibre
(b) impulse travels in the sensory fibre
(c) effector organ stimulated
(d) impulse crosses the synapse
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उत्तर
The pathway taken by nerve impulses in a reflex action is called a reflex arc. It is an automatic response to a stimulus. When a stimulus is given to a receptor, the receptors produce an impulse in the sensory fibre. The sensory fibre carries this message in the form of an electrical stimulus across the synapse. From the synapse, the impulse travels in the motor fibre and stimulates the effector organ to produce the desired response.
The correct order for a simple reflex arc is:
(b) →(d) → (a) → (c).
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संबंधित प्रश्न
Briefly explain the following terms : Reflex action
If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?
What is meant by receptors and effectors? Give two examples of each.
Explain the difference between of the following pair of terms :
receptor and effector
Which of the following helps in maintaining posture and balance of the human body?
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
Which of the following statements is correct about receptors?
The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex
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:
Lifting up a book: …………………..
Explain the following term :
Conditioned reflex
State whether the following is
Sneezing
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
Playing on the Keyboard
Mention, if the following statement is True or False
Reflex action is a unit of nervous action
Give an example for conditioned reflexes.
Reflex actions are mediated through ____________.
Which of the following is not involved in Knee-jerk reflex?
