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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
Give examples of unconditional reflexes
Name the most important part of the human brain.
State one function each of cerebellum and pons.
Which part of the eye contains cells which are sensitive to light?
What is meant by receptors and effectors? Give two examples of each.
What is a reflex action? Explain with the help of an example.
Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation
Which of the following statements is correct about receptors?
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?
Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?
State whether the following is simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
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
Explain the following term :
Conditioned reflex
State whether the following is
Cleaning
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
The reflex arc which is made up of one sensory and one motor neuron is ______
Reflex actions are mediated through ____________.
If after cutting through dorsal root of a spinal nerve of a mammal, the associated receptor in skin was stimulated the animal would ______.
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
